[llvm] 414ff81 - RegisterCoalescer: Add implicit-def of super register when coalescing SUBREG_TO_REG
Matt Arsenault via llvm-commits
llvm-commits at lists.llvm.org
Mon Oct 2 03:57:17 PDT 2023
Author: Matt Arsenault
Date: 2023-10-02T13:57:09+03:00
New Revision: 414ff812d6241b728754ce562081419e7fc091eb
URL: https://github.com/llvm/llvm-project/commit/414ff812d6241b728754ce562081419e7fc091eb
DIFF: https://github.com/llvm/llvm-project/commit/414ff812d6241b728754ce562081419e7fc091eb.diff
LOG: RegisterCoalescer: Add implicit-def of super register when coalescing SUBREG_TO_REG
Currently coalescing with SUBREG_TO_REG introduces an invisible load
bearing undef. There is liveness for the super register not
represented in the MIR.
This is part 1 of a fix for regressions that appeared after
b7836d856206ec39509d42529f958c920368166b. The allocator started
recognizing undef-def subregister MOVs as copies. Since there was no
representation for the dependency on the high bits, different undef
segments of the super register ended up disconnected and downstream
users ended up observing different undefs than they did previously.
This does not yet fix the regression. The isCopyInstr handling needs
to start handling implicit-defs on any instruction.
I wanted to include an end to end IR test since the actual failure
only appeared with an interaction between the coalescer and the
allocator. It's a bit bigger than I'd like but I'm having a bit of
trouble reducing it to something which definitely shows a diff that's
meaningful.
The same problem likely exists everywhere trying to do anything with
SUBREG_TO_REG. I don't understand how this managed to be broken for so
long.
This needs to be applied to the release branch.
https://reviews.llvm.org/D156345
Added:
llvm/test/CodeGen/X86/coalescer-breaks-subreg-to-reg-liveness.ll
llvm/test/CodeGen/X86/coalescing-subreg-to-reg-requires-subrange-update.mir
llvm/test/CodeGen/X86/subreg-to-reg-coalescing.mir
Modified:
llvm/lib/CodeGen/RegisterCoalescer.cpp
llvm/test/CodeGen/X86/bswap.ll
Removed:
################################################################################
diff --git a/llvm/lib/CodeGen/RegisterCoalescer.cpp b/llvm/lib/CodeGen/RegisterCoalescer.cpp
index 9410944705c1c89..a52b395dcfc8461 100644
--- a/llvm/lib/CodeGen/RegisterCoalescer.cpp
+++ b/llvm/lib/CodeGen/RegisterCoalescer.cpp
@@ -305,7 +305,11 @@ namespace {
/// number if it is not zero. If DstReg is a physical register and the
/// existing subregister number of the def / use being updated is not zero,
/// make sure to set it to the correct physical subregister.
- void updateRegDefsUses(Register SrcReg, Register DstReg, unsigned SubIdx);
+ ///
+ /// If \p IsSubregToReg, we are coalescing a DstReg = SUBREG_TO_REG
+ /// SrcReg. This introduces an implicit-def of DstReg on coalesced users.
+ void updateRegDefsUses(Register SrcReg, Register DstReg, unsigned SubIdx,
+ bool IsSubregToReg);
/// If the given machine operand reads only undefined lanes add an undef
/// flag.
@@ -1323,8 +1327,7 @@ bool RegisterCoalescer::reMaterializeTrivialDef(const CoalescerPair &CP,
if (DstReg.isPhysical()) {
Register NewDstReg = DstReg;
- unsigned NewDstIdx = TRI->composeSubRegIndices(CP.getSrcIdx(),
- DefMI->getOperand(0).getSubReg());
+ unsigned NewDstIdx = TRI->composeSubRegIndices(CP.getSrcIdx(), DefSubIdx);
if (NewDstIdx)
NewDstReg = TRI->getSubReg(DstReg, NewDstIdx);
@@ -1467,7 +1470,7 @@ bool RegisterCoalescer::reMaterializeTrivialDef(const CoalescerPair &CP,
MRI->setRegClass(DstReg, NewRC);
// Update machine operands and add flags.
- updateRegDefsUses(DstReg, DstReg, DstIdx);
+ updateRegDefsUses(DstReg, DstReg, DstIdx, false);
NewMI.getOperand(0).setSubReg(NewIdx);
// updateRegDefUses can add an "undef" flag to the definition, since
// it will replace DstReg with DstReg.DstIdx. If NewIdx is 0, make
@@ -1782,7 +1785,7 @@ void RegisterCoalescer::addUndefFlag(const LiveInterval &Int, SlotIndex UseIdx,
}
void RegisterCoalescer::updateRegDefsUses(Register SrcReg, Register DstReg,
- unsigned SubIdx) {
+ unsigned SubIdx, bool IsSubregToReg) {
bool DstIsPhys = DstReg.isPhysical();
LiveInterval *DstInt = DstIsPhys ? nullptr : &LIS->getInterval(DstReg);
@@ -1822,6 +1825,8 @@ void RegisterCoalescer::updateRegDefsUses(Register SrcReg, Register DstReg,
if (DstInt && !Reads && SubIdx && !UseMI->isDebugInstr())
Reads = DstInt->liveAt(LIS->getInstructionIndex(*UseMI));
+ bool FullDef = true;
+
// Replace SrcReg with DstReg in all UseMI operands.
for (unsigned i = 0, e = Ops.size(); i != e; ++i) {
MachineOperand &MO = UseMI->getOperand(Ops[i]);
@@ -1829,9 +1834,13 @@ void RegisterCoalescer::updateRegDefsUses(Register SrcReg, Register DstReg,
// Adjust <undef> flags in case of sub-register joins. We don't want to
// turn a full def into a read-modify-write sub-register def and vice
// versa.
- if (SubIdx && MO.isDef())
+ if (SubIdx && MO.isDef()) {
MO.setIsUndef(!Reads);
+ if (!Reads)
+ FullDef = false;
+ }
+
// A subreg use of a partially undef (super) register may be a complete
// undef use now and then has to be marked that way.
if (MO.isUse() && !DstIsPhys) {
@@ -1863,6 +1872,25 @@ void RegisterCoalescer::updateRegDefsUses(Register SrcReg, Register DstReg,
MO.substVirtReg(DstReg, SubIdx, *TRI);
}
+ if (IsSubregToReg && !FullDef) {
+ // If the coalesed instruction doesn't fully define the register, we need
+ // to preserve the original super register liveness for SUBREG_TO_REG.
+ //
+ // We pretended SUBREG_TO_REG was a regular copy for coalescing purposes,
+ // but it introduces liveness for other subregisters. Downstream users may
+ // have been relying on those bits, so we need to ensure their liveness is
+ // captured with a def of other lanes.
+
+ // FIXME: Need to add new subrange if tracking subranges. We could also
+ // skip adding this if we knew the other lanes are dead, and only for
+ // other lanes.
+
+ assert(!MRI->shouldTrackSubRegLiveness(DstReg) &&
+ "this should update subranges");
+ MachineInstrBuilder MIB(*MF, UseMI);
+ MIB.addReg(DstReg, RegState::ImplicitDefine);
+ }
+
LLVM_DEBUG({
dbgs() << "\t\tupdated: ";
if (!UseMI->isDebugInstr())
@@ -2062,6 +2090,8 @@ bool RegisterCoalescer::joinCopy(MachineInstr *CopyMI, bool &Again) {
});
}
+ const bool IsSubregToReg = CopyMI->isSubregToReg();
+
ShrinkMask = LaneBitmask::getNone();
ShrinkMainRange = false;
@@ -2129,9 +2159,12 @@ bool RegisterCoalescer::joinCopy(MachineInstr *CopyMI, bool &Again) {
// Rewrite all SrcReg operands to DstReg.
// Also update DstReg operands to include DstIdx if it is set.
- if (CP.getDstIdx())
- updateRegDefsUses(CP.getDstReg(), CP.getDstReg(), CP.getDstIdx());
- updateRegDefsUses(CP.getSrcReg(), CP.getDstReg(), CP.getSrcIdx());
+ if (CP.getDstIdx()) {
+ assert(!IsSubregToReg && "can this happen?");
+ updateRegDefsUses(CP.getDstReg(), CP.getDstReg(), CP.getDstIdx(), false);
+ }
+ updateRegDefsUses(CP.getSrcReg(), CP.getDstReg(), CP.getSrcIdx(),
+ IsSubregToReg);
// Shrink subregister ranges if necessary.
if (ShrinkMask.any()) {
diff --git a/llvm/test/CodeGen/X86/bswap.ll b/llvm/test/CodeGen/X86/bswap.ll
index 17fd612b812ebc1..fd5214ce45235e1 100644
--- a/llvm/test/CodeGen/X86/bswap.ll
+++ b/llvm/test/CodeGen/X86/bswap.ll
@@ -226,7 +226,7 @@ define i64 @finally_useful_bswap() {
; CHECK64: # %bb.0:
; CHECK64-NEXT: movzwl var16(%rip), %ecx
; CHECK64-NEXT: movzbl %cl, %eax
-; CHECK64-NEXT: # kill: def $ecx killed $ecx killed $rcx def $rcx
+; CHECK64-NEXT: # kill: def $ecx killed $ecx def $rcx killed $rcx
; CHECK64-NEXT: shrl $8, %ecx
; CHECK64-NEXT: shlq $8, %rax
; CHECK64-NEXT: orq %rcx, %rax
diff --git a/llvm/test/CodeGen/X86/coalescer-breaks-subreg-to-reg-liveness.ll b/llvm/test/CodeGen/X86/coalescer-breaks-subreg-to-reg-liveness.ll
new file mode 100644
index 000000000000000..f40605ca7110b9e
--- /dev/null
+++ b/llvm/test/CodeGen/X86/coalescer-breaks-subreg-to-reg-liveness.ll
@@ -0,0 +1,185 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
+; RUN: llc -mtriple=x86_64-grtev4-linux-gnu < %s | FileCheck %s
+
+%struct.wibble = type { %struct.wombat }
+%struct.wombat = type { %struct.ham, [3 x i8] }
+%struct.ham = type { %struct.zot }
+%struct.zot = type { %struct.blam }
+%struct.blam = type { %struct.ham.0 }
+%struct.ham.0 = type { %struct.bar }
+%struct.bar = type { %struct.bar.1 }
+%struct.bar.1 = type { %struct.baz, i8 }
+%struct.baz = type { %struct.snork }
+%struct.snork = type <{ %struct.spam, i8, [3 x i8] }>
+%struct.spam = type { %struct.snork.2, %struct.snork.2 }
+%struct.snork.2 = type { i32 }
+%struct.snork.3 = type { %struct.baz, i8, [3 x i8] }
+
+define void @foo(ptr %arg, ptr %arg1, i40 %arg2, ptr %arg3, i32 %arg4) #0 {
+; CHECK-LABEL: foo:
+; CHECK: # %bb.0: # %bb
+; CHECK-NEXT: pushq %rbp
+; CHECK-NEXT: .cfi_def_cfa_offset 16
+; CHECK-NEXT: .cfi_offset %rbp, -16
+; CHECK-NEXT: movq %rsp, %rbp
+; CHECK-NEXT: .cfi_def_cfa_register %rbp
+; CHECK-NEXT: pushq %r15
+; CHECK-NEXT: pushq %r14
+; CHECK-NEXT: pushq %r13
+; CHECK-NEXT: pushq %r12
+; CHECK-NEXT: pushq %rbx
+; CHECK-NEXT: subq $24, %rsp
+; CHECK-NEXT: .cfi_offset %rbx, -56
+; CHECK-NEXT: .cfi_offset %r12, -48
+; CHECK-NEXT: .cfi_offset %r13, -40
+; CHECK-NEXT: .cfi_offset %r14, -32
+; CHECK-NEXT: .cfi_offset %r15, -24
+; CHECK-NEXT: movl %r8d, %r14d
+; CHECK-NEXT: movq %rcx, {{[-0-9]+}}(%r{{[sb]}}p) # 8-byte Spill
+; CHECK-NEXT: movq %rdx, {{[-0-9]+}}(%r{{[sb]}}p) # 8-byte Spill
+; CHECK-NEXT: movq %rsi, %r13
+; CHECK-NEXT: movq %rdi, %r15
+; CHECK-NEXT: incl %r14d
+; CHECK-NEXT: xorl %ebx, %ebx
+; CHECK-NEXT: # implicit-def: $r12
+; CHECK-NEXT: movq %rsi, {{[-0-9]+}}(%r{{[sb]}}p) # 8-byte Spill
+; CHECK-NEXT: jmp .LBB0_3
+; CHECK-NEXT: .p2align 4, 0x90
+; CHECK-NEXT: .LBB0_1: # %bb17
+; CHECK-NEXT: # in Loop: Header=BB0_3 Depth=1
+; CHECK-NEXT: movq %r15, %r13
+; CHECK-NEXT: xorl %r15d, %r15d
+; CHECK-NEXT: testq %rbx, %rbx
+; CHECK-NEXT: sete %r15b
+; CHECK-NEXT: xorl %edi, %edi
+; CHECK-NEXT: callq _Znwm at PLT
+; CHECK-NEXT: shlq $4, %r15
+; CHECK-NEXT: addq {{[-0-9]+}}(%r{{[sb]}}p), %r15 # 8-byte Folded Reload
+; CHECK-NEXT: movq %r12, %rcx
+; CHECK-NEXT: shrq $32, %rcx
+; CHECK-NEXT: movb %cl, 12(%rax)
+; CHECK-NEXT: movl %r12d, 8(%rax)
+; CHECK-NEXT: movq %r15, %rbx
+; CHECK-NEXT: movq %r13, %r15
+; CHECK-NEXT: movq {{[-0-9]+}}(%r{{[sb]}}p), %r13 # 8-byte Reload
+; CHECK-NEXT: decl %r14d
+; CHECK-NEXT: je .LBB0_8
+; CHECK-NEXT: .LBB0_3: # %bb7
+; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
+; CHECK-NEXT: callq widget at PLT
+; CHECK-NEXT: cmpb $-5, (%r13)
+; CHECK-NEXT: jae .LBB0_5
+; CHECK-NEXT: # %bb.4: # in Loop: Header=BB0_3 Depth=1
+; CHECK-NEXT: movl %r12d, %r12d
+; CHECK-NEXT: cmpq %r15, %rbx
+; CHECK-NEXT: jbe .LBB0_1
+; CHECK-NEXT: jmp .LBB0_7
+; CHECK-NEXT: .p2align 4, 0x90
+; CHECK-NEXT: .LBB0_5: # %bb12
+; CHECK-NEXT: # in Loop: Header=BB0_3 Depth=1
+; CHECK-NEXT: movq 0, %rax
+; CHECK-NEXT: movq 8, %rax
+; CHECK-NEXT: movq {{[-0-9]+}}(%r{{[sb]}}p), %r12 # 8-byte Reload
+; CHECK-NEXT: cmpq %r15, %rbx
+; CHECK-NEXT: jbe .LBB0_1
+; CHECK-NEXT: .LBB0_7: # in Loop: Header=BB0_3 Depth=1
+; CHECK-NEXT: xorl %eax, %eax
+; CHECK-NEXT: xorl %ebx, %ebx
+; CHECK-NEXT: decl %r14d
+; CHECK-NEXT: jne .LBB0_3
+; CHECK-NEXT: .LBB0_8: # %bb21
+; CHECK-NEXT: cmpb $0, 12(%rax)
+; CHECK-NEXT: jne .LBB0_10
+; CHECK-NEXT: # %bb.9: # %bb26
+; CHECK-NEXT: addq $24, %rsp
+; CHECK-NEXT: popq %rbx
+; CHECK-NEXT: popq %r12
+; CHECK-NEXT: popq %r13
+; CHECK-NEXT: popq %r14
+; CHECK-NEXT: popq %r15
+; CHECK-NEXT: popq %rbp
+; CHECK-NEXT: .cfi_def_cfa %rsp, 8
+; CHECK-NEXT: retq
+; CHECK-NEXT: .LBB0_10: # %bb25
+; CHECK-NEXT: .cfi_def_cfa %rbp, 16
+; CHECK-NEXT: movq %r15, %rdi
+; CHECK-NEXT: callq pluto at PLT
+bb:
+ br label %bb7
+
+bb5: ; preds = %bb17, %bb14
+ %phi = phi ptr [ %call19, %bb17 ], [ null, %bb14 ]
+ %phi6 = phi ptr [ %getelementptr, %bb17 ], [ null, %bb14 ]
+ %add = add i32 %phi9, 1
+ %icmp = icmp eq i32 %phi9, %arg4
+ br i1 %icmp, label %bb21, label %bb7
+
+bb7: ; preds = %bb5, %bb
+ %phi8 = phi ptr [ null, %bb ], [ %phi6, %bb5 ]
+ %phi9 = phi i32 [ 0, %bb ], [ %add, %bb5 ]
+ %phi10 = phi i40 [ undef, %bb ], [ %phi15, %bb5 ]
+ %call = call ptr @widget()
+ %load = load i8, ptr %arg1, align 8
+ %icmp11 = icmp ult i8 %load, -5
+ %and = and i40 %phi10, 4294967295
+ br i1 %icmp11, label %bb14, label %bb12
+
+bb12: ; preds = %bb7
+ %load13 = load volatile { i64, i64 }, ptr null, align 4294967296
+ br label %bb14
+
+bb14: ; preds = %bb12, %bb7
+ %phi15 = phi i40 [ %and, %bb7 ], [ %arg2, %bb12 ]
+ %icmp16 = icmp ugt ptr %phi8, %arg
+ br i1 %icmp16, label %bb5, label %bb17
+
+bb17: ; preds = %bb14
+ %icmp18 = icmp eq ptr %phi8, null
+ %zext = zext i1 %icmp18 to i64
+ %call19 = call ptr @_Znwm(i64 0)
+ %getelementptr = getelementptr %struct.wibble, ptr %arg3, i64 %zext
+ %getelementptr20 = getelementptr i8, ptr %call19, i64 8
+ store i40 %phi15, ptr %getelementptr20, align 4
+ br label %bb5
+
+bb21: ; preds = %bb5
+ %getelementptr22 = getelementptr %struct.snork.3, ptr %phi, i64 0, i32 1
+ %load23 = load i8, ptr %getelementptr22, align 4
+ %icmp24 = icmp eq i8 %load23, 0
+ br i1 %icmp24, label %bb26, label %bb25
+
+bb25: ; preds = %bb21
+ call void @pluto(ptr %arg)
+ unreachable
+
+bb26: ; preds = %bb21
+ ret void
+}
+
+define void @eggs(ptr %arg, ptr %arg1) {
+; CHECK-LABEL: eggs:
+; CHECK: # %bb.0: # %bb
+; CHECK-NEXT: pushq %rax
+; CHECK-NEXT: .cfi_def_cfa_offset 16
+; CHECK-NEXT: movq %rdi, %rax
+; CHECK-NEXT: movq %rsi, %rdi
+; CHECK-NEXT: movq %rax, %rsi
+; CHECK-NEXT: xorl %edx, %edx
+; CHECK-NEXT: xorl %ecx, %ecx
+; CHECK-NEXT: xorl %r8d, %r8d
+; CHECK-NEXT: callq foo at PLT
+; CHECK-NEXT: popq %rax
+; CHECK-NEXT: .cfi_def_cfa_offset 8
+; CHECK-NEXT: retq
+bb:
+ call void @foo(ptr %arg1, ptr %arg, i40 0, ptr null, i32 0)
+ ret void
+}
+
+declare ptr @widget()
+
+declare void @pluto(ptr)
+
+declare ptr @_Znwm(i64)
+
+attributes #0 = { noinline "frame-pointer"="all" }
diff --git a/llvm/test/CodeGen/X86/coalescing-subreg-to-reg-requires-subrange-update.mir b/llvm/test/CodeGen/X86/coalescing-subreg-to-reg-requires-subrange-update.mir
new file mode 100644
index 000000000000000..fe53aef86e83596
--- /dev/null
+++ b/llvm/test/CodeGen/X86/coalescing-subreg-to-reg-requires-subrange-update.mir
@@ -0,0 +1,47 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 3
+# RUN: llc -mtriple=x86_64-- -run-pass=register-coalescer -enable-subreg-liveness -verify-coalescing -o - %s | FileCheck %s
+
+
+# FIXME: Need to handle subrange updates when coalescing with subreg_to_reg
+# This will fail if x86 enables subregister liveness.
+---
+name: requires_new_subrange_coalesce_subreg_to_reg
+tracksRegLiveness: true
+body: |
+ ; CHECK-LABEL: name: requires_new_subrange_coalesce_subreg_to_reg
+ ; CHECK: bb.0:
+ ; CHECK-NEXT: successors: %bb.2(0x40000000), %bb.1(0x40000000)
+ ; CHECK-NEXT: liveins: $eax
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: undef %a.sub_32bit:gr64_with_sub_8bit = COPY $eax
+ ; CHECK-NEXT: %b:gr32 = IMPLICIT_DEF
+ ; CHECK-NEXT: %c:gr64 = INSERT_SUBREG %a, %b, %subreg.sub_32bit
+ ; CHECK-NEXT: JCC_1 %bb.2, 4, implicit undef $eflags
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: bb.1:
+ ; CHECK-NEXT: successors: %bb.2(0x80000000)
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: undef %a.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags
+ ; CHECK-NEXT: %c.sub_32bit:gr64 = COPY %a
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: bb.2:
+ ; CHECK-NEXT: %c.sub_32bit:gr64 = SUBREG_TO_REG %a, %b, %subreg.sub_32bit
+ ; CHECK-NEXT: RET 0, implicit %c
+ bb.0:
+ liveins: $eax
+ %init_eax:gr32 = COPY $eax
+ %a:gr64 = SUBREG_TO_REG 0, %init_eax, %subreg.sub_32bit
+ %b:gr32 = IMPLICIT_DEF
+ %c:gr64 = INSERT_SUBREG %a, %b, %subreg.sub_32bit
+ JCC_1 %bb.2, 4, implicit undef $eflags
+
+ bb.1:
+ %imm0:gr32 = MOV32r0 implicit-def dead $eflags
+ %a = SUBREG_TO_REG 0, %imm0, %subreg.sub_32bit
+ %c.sub_32bit = COPY %a
+
+ bb.2:
+ %c.sub_32bit = SUBREG_TO_REG %a, %b, %subreg.sub_32bit
+ RET 0, implicit %c
+
+...
diff --git a/llvm/test/CodeGen/X86/subreg-to-reg-coalescing.mir b/llvm/test/CodeGen/X86/subreg-to-reg-coalescing.mir
new file mode 100644
index 000000000000000..6121a0bcc564148
--- /dev/null
+++ b/llvm/test/CodeGen/X86/subreg-to-reg-coalescing.mir
@@ -0,0 +1,348 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 2
+# RUN: llc -mtriple=x86_64-- -run-pass=register-coalescer -o - %s | FileCheck %s
+
+# We cannot lose the liveness of the high subregister of %1 when
+# coalesced with %0, so introduce an implicit-def of the super
+# register on the MOV.
+
+---
+name: coalesce_mov32r0_into_subreg_to_reg64
+tracksRegLiveness: true
+body: |
+ bb.0:
+ ; CHECK-LABEL: name: coalesce_mov32r0_into_subreg_to_reg64
+ ; CHECK: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: undef %1.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags, implicit-def %1
+ ; CHECK-NEXT: dead $edi = MOV32r0 implicit-def dead $eflags, implicit-def $rdi
+ ; CHECK-NEXT: CALL64r %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: RET 0
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ %0:gr32 = MOV32r0 implicit-def dead $eflags
+ %1:gr64 = SUBREG_TO_REG 0, killed %0, %subreg.sub_32bit
+ $rdi = COPY %1
+ CALL64r killed %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ RET 0
+
+...
+
+---
+name: subreg_to_reg_folds_to_undef
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $rax
+
+ ; CHECK-LABEL: name: subreg_to_reg_folds_to_undef
+ ; CHECK: liveins: $rax
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[COPY:%[0-9]+]]:gr64_with_sub_8bit = COPY $rax
+ ; CHECK-NEXT: undef %4.sub_32bit:gr64_with_sub_8bit = MOV32rr [[COPY]].sub_32bit, implicit-def %4
+ ; CHECK-NEXT: RET 0, implicit %4
+ %0:gr64 = COPY killed $rax
+ %1:gr32 = COPY killed %0.sub_32bit
+ %2:gr32 = MOV32rr killed %1
+ %3:gr64 = SUBREG_TO_REG 0, killed %2, %subreg.sub_32bit
+ %4:gr64 = COPY killed %3
+ RET 0, implicit %4
+
+...
+
+---
+name: coalesce_mov32r0_subreg_def_into_subreg_to_reg64
+tracksRegLiveness: true
+body: |
+ bb.0:
+ ; CHECK-LABEL: name: coalesce_mov32r0_subreg_def_into_subreg_to_reg64
+ ; CHECK: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: undef %1.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags
+ ; CHECK-NEXT: dead $edi = MOV32r0 implicit-def dead $eflags, implicit-def $rdi
+ ; CHECK-NEXT: CALL64r %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: RET 0
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ undef %0.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags
+ %1:gr64 = SUBREG_TO_REG 0, killed %0.sub_32bit, %subreg.sub_32bit
+ $rdi = COPY %1
+ CALL64r killed %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ RET 0
+
+...
+
+---
+name: coalesce_mov32r0_into_subreg_def_with_super_def_to_reg64
+tracksRegLiveness: true
+body: |
+ bb.0:
+ ; CHECK-LABEL: name: coalesce_mov32r0_into_subreg_def_with_super_def_to_reg64
+ ; CHECK: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: undef %1.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags, implicit-def %1
+ ; CHECK-NEXT: dead $edi = MOV32r0 implicit-def dead $eflags, implicit-def $rdi
+ ; CHECK-NEXT: CALL64r %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: RET 0
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ undef %0.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags, implicit-def %0
+ %1:gr64 = SUBREG_TO_REG 0, killed %0.sub_32bit, %subreg.sub_32bit
+ $rdi = COPY %1
+ CALL64r killed %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ RET 0
+
+...
+
+---
+name: coalesce_mov32r0_into_subreg_to_reg64_already_defs_other_subreg
+tracksRegLiveness: true
+body: |
+ bb.0:
+ ; CHECK-LABEL: name: coalesce_mov32r0_into_subreg_to_reg64_already_defs_other_subreg
+ ; CHECK: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: undef %1.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags, implicit-def undef %1.sub_8bit, implicit-def %1
+ ; CHECK-NEXT: INLINEASM &"", 0 /* attdialect */, implicit %1
+ ; CHECK-NEXT: CALL64r %1, csr_64, implicit $rsp, implicit $ssp, implicit undef $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: RET 0
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ %0:gr32 = MOV32r0 implicit-def dead $eflags, implicit-def undef %0.sub_8bit
+ %1:gr64 = SUBREG_TO_REG 0, killed %0, %subreg.sub_32bit
+ INLINEASM &"", 0, implicit %1
+ CALL64r killed %1, csr_64, implicit $rsp, implicit $ssp, implicit undef $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ RET 0
+
+...
+
+
+# Reduced realistic case which was asserting after introducing new implicit-defs
+---
+name: coalesce_needs_implicit_defs
+tracksRegLiveness: true
+body: |
+ ; CHECK-LABEL: name: coalesce_needs_implicit_defs
+ ; CHECK: bb.0:
+ ; CHECK-NEXT: successors: %bb.1(0x80000000)
+ ; CHECK-NEXT: liveins: $rdi
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[COPY:%[0-9]+]]:gr64 = COPY $rdi
+ ; CHECK-NEXT: undef %2.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags, implicit-def %2
+ ; CHECK-NEXT: undef %3.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags, implicit-def %3
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: bb.1:
+ ; CHECK-NEXT: successors: %bb.1(0x80000000)
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: undef %10.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags
+ ; CHECK-NEXT: TEST64rr %3, %3, implicit-def $eflags
+ ; CHECK-NEXT: %10.sub_8bit:gr64_with_sub_8bit = SETCCr 4, implicit killed $eflags
+ ; CHECK-NEXT: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: dead $edi = MOV32r0 implicit-def dead $eflags, implicit-def $rdi
+ ; CHECK-NEXT: CALL64r %2, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: [[SHL64ri:%[0-9]+]]:gr64_with_sub_8bit = SHL64ri [[SHL64ri]], 4, implicit-def dead $eflags
+ ; CHECK-NEXT: [[ADD64rr:%[0-9]+]]:gr64_with_sub_8bit = ADD64rr [[ADD64rr]], [[COPY]], implicit-def dead $eflags
+ ; CHECK-NEXT: [[COPY1:%[0-9]+]]:gr64_with_sub_8bit = COPY [[ADD64rr]]
+ ; CHECK-NEXT: JMP_1 %bb.1
+ bb.0:
+ liveins: $rdi
+
+ %0:gr64 = COPY killed $rdi
+ %1:gr32 = MOV32r0 implicit-def dead $eflags
+ %2:gr64 = SUBREG_TO_REG 0, %1, %subreg.sub_32bit
+ %3:gr64 = COPY killed %2
+
+ bb.1:
+ %4:gr64 = COPY killed %3
+ %5:gr32 = MOV32r0 implicit-def dead $eflags
+ TEST64rr killed %4, %4, implicit-def $eflags
+ %6:gr8 = SETCCr 4, implicit killed $eflags
+ %7:gr32 = COPY killed %5
+ %7.sub_8bit:gr32 = COPY killed %6
+ %8:gr64 = SUBREG_TO_REG 0, killed %7, %subreg.sub_32bit
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ %9:gr64 = SUBREG_TO_REG 0, %1, %subreg.sub_32bit
+ $rdi = COPY %9
+ CALL64r killed %9, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ %10:gr64 = COPY killed %8
+ %10:gr64 = SHL64ri %10, 4, implicit-def dead $eflags
+ %11:gr64 = COPY killed %10
+ %11:gr64 = ADD64rr %11, %0, implicit-def dead $eflags
+ %3:gr64 = COPY killed %11
+ JMP_1 %bb.1
+
+...
+
+---
+name: coalesce_mov32r0_into_subreg_to_reg64_physreg_def
+tracksRegLiveness: true
+body: |
+ bb.0:
+ ; CHECK-LABEL: name: coalesce_mov32r0_into_subreg_to_reg64_physreg_def
+ ; CHECK: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: dead $edi = MOV32r0 implicit-def dead $eflags, implicit-def $rdi
+ ; CHECK-NEXT: CALL64r killed $rdi, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: RET 0
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ %0:gr32 = MOV32r0 implicit-def dead $eflags
+ $rdi = SUBREG_TO_REG 0, killed %0, %subreg.sub_32bit
+ CALL64r killed $rdi, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ RET 0
+
+...
+
+---
+name: coalesce_mov32r0_into_subreg_to_reg64_physreg_use
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $eax
+ ; CHECK-LABEL: name: coalesce_mov32r0_into_subreg_to_reg64_physreg_use
+ ; CHECK: liveins: $eax
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: $eax = MOV32r0 implicit-def dead $eflags
+ ; CHECK-NEXT: [[SUBREG_TO_REG:%[0-9]+]]:gr64 = SUBREG_TO_REG 0, $eax, %subreg.sub_32bit
+ ; CHECK-NEXT: $rdi = COPY [[SUBREG_TO_REG]]
+ ; CHECK-NEXT: CALL64r [[SUBREG_TO_REG]], csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: RET 0
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ $eax = MOV32r0 implicit-def dead $eflags
+ %1:gr64 = SUBREG_TO_REG 0, killed $eax, %subreg.sub_32bit
+ $rdi = COPY %1
+ CALL64r killed %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ RET 0
+
+...
+
+# Coalesced instruction is a copy with other implicit operands
+---
+name: coalesce_copy_into_subreg_to_reg64
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $eax
+ ; CHECK-LABEL: name: coalesce_copy_into_subreg_to_reg64
+ ; CHECK: liveins: $eax
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: undef %1.sub_32bit:gr64_with_sub_8bit = COPY $eax, implicit-def dead $eflags, implicit-def %1
+ ; CHECK-NEXT: $rdi = COPY %1
+ ; CHECK-NEXT: CALL64r %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: RET 0
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ %0:gr32 = COPY $eax, implicit-def dead $eflags
+ %1:gr64 = SUBREG_TO_REG 0, killed %0, %subreg.sub_32bit
+ $rdi = COPY %1
+ CALL64r killed %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ RET 0
+
+...
+
+---
+name: coalesce_mov32r0_into_subreg_to_reg64_multiple_redef_value
+tracksRegLiveness: true
+body: |
+ bb.0:
+ ; CHECK-LABEL: name: coalesce_mov32r0_into_subreg_to_reg64_multiple_redef_value
+ ; CHECK: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: undef %1.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags, implicit-def %1
+ ; CHECK-NEXT: INLINEASM &"", 0 /* attdialect */, implicit-def %1.sub_32bit, implicit %1.sub_32bit
+ ; CHECK-NEXT: $rdi = COPY %1
+ ; CHECK-NEXT: CALL64r %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: RET 0
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ %0:gr32 = MOV32r0 implicit-def dead $eflags
+ INLINEASM &"", 0, implicit-def %0, implicit %0
+ %1:gr64 = SUBREG_TO_REG 0, killed %0, %subreg.sub_32bit
+ $rdi = COPY %1
+ CALL64r killed %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ RET 0
+
+...
+
+---
+name: coalesce_mov32r0_into_subreg_to_reg64_def_is_block_liveout
+tracksRegLiveness: true
+body: |
+ ; CHECK-LABEL: name: coalesce_mov32r0_into_subreg_to_reg64_def_is_block_liveout
+ ; CHECK: bb.0:
+ ; CHECK-NEXT: successors: %bb.1(0x40000000), %bb.2(0x40000000)
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: INLINEASM &"", 0 /* attdialect */, implicit-def undef %1.sub_32bit, implicit-def %1
+ ; CHECK-NEXT: JCC_1 %bb.1, 4, implicit undef $eflags
+ ; CHECK-NEXT: JMP_1 %bb.2
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: bb.1:
+ ; CHECK-NEXT: $rdi = COPY %1
+ ; CHECK-NEXT: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: CALL64r %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: RET 0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: bb.2:
+ bb.0:
+ INLINEASM &"", 0, implicit-def %0:gr32
+ JCC_1 %bb.1, 4, implicit undef $eflags
+ JMP_1 %bb.2
+
+ bb.1:
+ %1:gr64 = SUBREG_TO_REG 0, killed %0, %subreg.sub_32bit
+ $rdi = COPY %1
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ CALL64r killed %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ RET 0
+
+ bb.2:
+
+...
+
+---
+name: coalesce_mov32r0_into_subreg_to_reg64_def_is_phi_def
+tracksRegLiveness: true
+body: |
+ ; CHECK-LABEL: name: coalesce_mov32r0_into_subreg_to_reg64_def_is_phi_def
+ ; CHECK: bb.0:
+ ; CHECK-NEXT: successors: %bb.1(0x40000000), %bb.2(0x40000000)
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: INLINEASM &"", 0 /* attdialect */, implicit-def undef %1.sub_32bit, implicit-def %1
+ ; CHECK-NEXT: JCC_1 %bb.1, 4, implicit undef $eflags
+ ; CHECK-NEXT: JMP_1 %bb.2
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: bb.1:
+ ; CHECK-NEXT: successors: %bb.1(0x80000000)
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: $rdi = COPY %1
+ ; CHECK-NEXT: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: CALL64r %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ; CHECK-NEXT: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ ; CHECK-NEXT: JMP_1 %bb.1
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: bb.2:
+ bb.0:
+
+ INLINEASM &"", 0, implicit-def %0:gr32
+ JCC_1 %bb.1, 4, implicit undef $eflags
+ JMP_1 %bb.2
+
+ bb.1:
+ %1:gr64 = SUBREG_TO_REG 0, %0, %subreg.sub_32bit
+ $rdi = COPY %1
+ ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ CALL64r %1, csr_64, implicit $rsp, implicit $ssp, implicit killed $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
+ ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
+ JMP_1 %bb.1
+
+ bb.2:
+
+...
More information about the llvm-commits
mailing list