[llvm] Add support for x87 registers on GISel register selection (PR #83528)
via llvm-commits
llvm-commits at lists.llvm.org
Thu Feb 29 21:52:36 PST 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-globalisel
Author: None (MalaySanghiIntel)
<details>
<summary>Changes</summary>
We handle 3 register classes for x87 - rfp32, rfp64 and rfp80.
1. X87 registers are assigned a pseudo register class. We need a new register bank for these classes.
2. We add bank information and enums for these.
3. Legalizer is updated to allow 32b and 64b even in absence of SSE. This is required because with SSE enabled, x86 doesn't use fp stack and instead uses AVX registers.
4. Functions in X86RegisterBankInfo need to decide whether to use the pseudo classes or SSE-enabled classes. I add MachineInstr as an argument to static helper function getPartialMappingIdx to this end.
Add/Update tests.
---
Patch is 24.05 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/83528.diff
7 Files Affected:
- (modified) llvm/lib/Target/X86/GISel/X86LegalizerInfo.cpp (+8-5)
- (modified) llvm/lib/Target/X86/GISel/X86RegisterBankInfo.cpp (+28-12)
- (modified) llvm/lib/Target/X86/GISel/X86RegisterBankInfo.h (+2-1)
- (modified) llvm/lib/Target/X86/X86GenRegisterBankInfo.def (+15-2)
- (modified) llvm/lib/Target/X86/X86RegisterBanks.td (+3)
- (added) llvm/test/CodeGen/X86/GlobalISel/regbankselect-x87.ll (+237)
- (modified) llvm/test/CodeGen/X86/GlobalISel/x86_64-fallback.ll (+1-1)
``````````diff
diff --git a/llvm/lib/Target/X86/GISel/X86LegalizerInfo.cpp b/llvm/lib/Target/X86/GISel/X86LegalizerInfo.cpp
index 27381dff338e2d..2e33adaed7a847 100644
--- a/llvm/lib/Target/X86/GISel/X86LegalizerInfo.cpp
+++ b/llvm/lib/Target/X86/GISel/X86LegalizerInfo.cpp
@@ -39,6 +39,7 @@ X86LegalizerInfo::X86LegalizerInfo(const X86Subtarget &STI,
bool HasVLX = Subtarget.hasVLX();
bool HasDQI = Subtarget.hasAVX512() && Subtarget.hasDQI();
bool HasBWI = Subtarget.hasAVX512() && Subtarget.hasBWI();
+ bool UseX87 = !Subtarget.useSoftFloat() && Subtarget.hasX87();
const LLT p0 = LLT::pointer(0, TM.getPointerSizeInBits(0));
const LLT s1 = LLT::scalar(1);
@@ -415,17 +416,19 @@ X86LegalizerInfo::X86LegalizerInfo(const X86Subtarget &STI,
// fp constants
getActionDefinitionsBuilder(G_FCONSTANT)
.legalIf([=](const LegalityQuery &Query) -> bool {
- return (HasSSE1 && typeInSet(0, {s32})(Query)) ||
- (HasSSE2 && typeInSet(0, {s64})(Query));
+ return (typeInSet(0, {s32, s64})(Query)) ||
+ (UseX87 && typeInSet(0, {s80})(Query));
});
// fp arithmetic
getActionDefinitionsBuilder({G_FADD, G_FSUB, G_FMUL, G_FDIV})
.legalIf([=](const LegalityQuery &Query) {
- return (HasSSE1 && typeInSet(0, {s32, v4s32})(Query)) ||
- (HasSSE2 && typeInSet(0, {s64, v2s64})(Query)) ||
+ return (typeInSet(0, {s32, s64})(Query)) ||
+ (HasSSE1 && typeInSet(0, {v4s32})(Query)) ||
+ (HasSSE2 && typeInSet(0, {v2s64})(Query)) ||
(HasAVX && typeInSet(0, {v8s32, v4s64})(Query)) ||
- (HasAVX512 && typeInSet(0, {v16s32, v8s64})(Query));
+ (HasAVX512 && typeInSet(0, {v16s32, v8s64})(Query)) ||
+ (UseX87 && typeInSet(0, {s80})(Query));
});
// fp comparison
diff --git a/llvm/lib/Target/X86/GISel/X86RegisterBankInfo.cpp b/llvm/lib/Target/X86/GISel/X86RegisterBankInfo.cpp
index 72828f961f9317..ad6fb8a601315a 100644
--- a/llvm/lib/Target/X86/GISel/X86RegisterBankInfo.cpp
+++ b/llvm/lib/Target/X86/GISel/X86RegisterBankInfo.cpp
@@ -12,6 +12,7 @@
#include "X86RegisterBankInfo.h"
#include "X86InstrInfo.h"
+#include "X86Subtarget.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterBank.h"
#include "llvm/CodeGen/RegisterBankInfo.h"
@@ -59,11 +60,24 @@ X86RegisterBankInfo::getRegBankFromRegClass(const TargetRegisterClass &RC,
X86::VR512RegClass.hasSubClassEq(&RC))
return getRegBank(X86::VECRRegBankID);
+ if (X86::RFP80RegClass.hasSubClassEq(&RC) ||
+ X86::RFP32RegClass.hasSubClassEq(&RC) ||
+ X86::RFP64RegClass.hasSubClassEq(&RC))
+ return getRegBank(X86::PSRRegBankID);
+
llvm_unreachable("Unsupported register kind yet.");
}
X86GenRegisterBankInfo::PartialMappingIdx
-X86GenRegisterBankInfo::getPartialMappingIdx(const LLT &Ty, bool isFP) {
+X86GenRegisterBankInfo::getPartialMappingIdx(const MachineInstr &MI,
+ const LLT &Ty, bool isFP) {
+ const MachineFunction *MF = MI.getMF();
+ const X86Subtarget *ST = &MF->getSubtarget<X86Subtarget>();
+ bool HasSSE1 = ST->hasSSE1();
+ bool HasSSE2 = ST->hasSSE2();
+ // 80 bits is only generated for X87 floating points.
+ if (Ty.getSizeInBits() == 80)
+ isFP = true;
if ((Ty.isScalar() && !isFP) || Ty.isPointer()) {
switch (Ty.getSizeInBits()) {
case 1:
@@ -84,11 +98,13 @@ X86GenRegisterBankInfo::getPartialMappingIdx(const LLT &Ty, bool isFP) {
} else if (Ty.isScalar()) {
switch (Ty.getSizeInBits()) {
case 32:
- return PMI_FP32;
+ return HasSSE1 ? PMI_FP32 : PMI_PSR32;
case 64:
- return PMI_FP64;
+ return HasSSE2 ? PMI_FP64 : PMI_PSR64;
case 128:
return PMI_VEC128;
+ case 80:
+ return PMI_PSR80;
default:
llvm_unreachable("Unsupported register size.");
}
@@ -118,7 +134,8 @@ void X86RegisterBankInfo::getInstrPartialMappingIdxs(
if (!MO.isReg() || !MO.getReg())
OpRegBankIdx[Idx] = PMI_None;
else
- OpRegBankIdx[Idx] = getPartialMappingIdx(MRI.getType(MO.getReg()), isFP);
+ OpRegBankIdx[Idx] =
+ getPartialMappingIdx(MI, MRI.getType(MO.getReg()), isFP);
}
}
@@ -156,7 +173,7 @@ X86RegisterBankInfo::getSameOperandsMapping(const MachineInstr &MI,
(Ty != MRI.getType(MI.getOperand(2).getReg())))
llvm_unreachable("Unsupported operand mapping yet.");
- auto Mapping = getValueMapping(getPartialMappingIdx(Ty, isFP), 3);
+ auto Mapping = getValueMapping(getPartialMappingIdx(MI, Ty, isFP), 3);
return getInstructionMapping(DefaultMappingID, 1, Mapping, NumOperands);
}
@@ -190,9 +207,8 @@ X86RegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
unsigned NumOperands = MI.getNumOperands();
LLT Ty = MRI.getType(MI.getOperand(0).getReg());
- auto Mapping = getValueMapping(getPartialMappingIdx(Ty, false), 3);
+ auto Mapping = getValueMapping(getPartialMappingIdx(MI, Ty, false), 3);
return getInstructionMapping(DefaultMappingID, 1, Mapping, NumOperands);
-
}
default:
break;
@@ -219,8 +235,8 @@ X86RegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
bool FirstArgIsFP = Opc == TargetOpcode::G_SITOFP;
bool SecondArgIsFP = Opc == TargetOpcode::G_FPTOSI;
- OpRegBankIdx[0] = getPartialMappingIdx(Ty0, /* isFP */ FirstArgIsFP);
- OpRegBankIdx[1] = getPartialMappingIdx(Ty1, /* isFP */ SecondArgIsFP);
+ OpRegBankIdx[0] = getPartialMappingIdx(MI, Ty0, /* isFP */ FirstArgIsFP);
+ OpRegBankIdx[1] = getPartialMappingIdx(MI, Ty1, /* isFP */ SecondArgIsFP);
break;
}
case TargetOpcode::G_FCMP: {
@@ -234,7 +250,7 @@ X86RegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
(void)Size;
assert((Size == 32 || Size == 64) && "Unsupported size for G_FCMP");
- auto FpRegBank = getPartialMappingIdx(Ty1, /* isFP */ true);
+ auto FpRegBank = getPartialMappingIdx(MI, Ty1, /* isFP */ true);
OpRegBankIdx = {PMI_GPR8,
/* Predicate */ PMI_None, FpRegBank, FpRegBank};
break;
@@ -288,9 +304,9 @@ X86RegisterBankInfo::getInstrAlternativeMappings(const MachineInstr &MI) const {
case TargetOpcode::G_LOAD:
case TargetOpcode::G_STORE:
case TargetOpcode::G_IMPLICIT_DEF: {
- // we going to try to map 32/64 bit to PMI_FP32/PMI_FP64
+ // we going to try to map 32/64/80 bit to PMI_FP32/PMI_FP64/PMI_FP80
unsigned Size = getSizeInBits(MI.getOperand(0).getReg(), MRI, TRI);
- if (Size != 32 && Size != 64)
+ if (Size != 32 && Size != 64 && Size != 80)
break;
unsigned NumOperands = MI.getNumOperands();
diff --git a/llvm/lib/Target/X86/GISel/X86RegisterBankInfo.h b/llvm/lib/Target/X86/GISel/X86RegisterBankInfo.h
index 9a4e23d8b34d54..989c5956ad5917 100644
--- a/llvm/lib/Target/X86/GISel/X86RegisterBankInfo.h
+++ b/llvm/lib/Target/X86/GISel/X86RegisterBankInfo.h
@@ -32,7 +32,8 @@ class X86GenRegisterBankInfo : public RegisterBankInfo {
static RegisterBankInfo::PartialMapping PartMappings[];
static RegisterBankInfo::ValueMapping ValMappings[];
- static PartialMappingIdx getPartialMappingIdx(const LLT &Ty, bool isFP);
+ static PartialMappingIdx getPartialMappingIdx(const MachineInstr &MI,
+ const LLT &Ty, bool isFP);
static const RegisterBankInfo::ValueMapping *
getValueMapping(PartialMappingIdx Idx, unsigned NumOperands);
};
diff --git a/llvm/lib/Target/X86/X86GenRegisterBankInfo.def b/llvm/lib/Target/X86/X86GenRegisterBankInfo.def
index 0fdea9071c290d..11a28806710d74 100644
--- a/llvm/lib/Target/X86/X86GenRegisterBankInfo.def
+++ b/llvm/lib/Target/X86/X86GenRegisterBankInfo.def
@@ -25,6 +25,10 @@ RegisterBankInfo::PartialMapping X86GenRegisterBankInfo::PartMappings[]{
{0, 128, X86::VECRRegBank}, // :6
{0, 256, X86::VECRRegBank}, // :7
{0, 512, X86::VECRRegBank}, // :8
+ // RFP32/64/80
+ {0, 32, X86::PSRRegBank}, // :9
+ {0, 64, X86::PSRRegBank}, // :10
+ {0, 80, X86::PSRRegBank}, // :11
};
#endif // GET_TARGET_REGBANK_INFO_IMPL
@@ -39,7 +43,10 @@ enum PartialMappingIdx {
PMI_FP64,
PMI_VEC128,
PMI_VEC256,
- PMI_VEC512
+ PMI_VEC512,
+ PMI_PSR32,
+ PMI_PSR64,
+ PMI_PSR80
};
#endif // GET_TARGET_REGBANK_INFO_CLASS
@@ -61,6 +68,9 @@ RegisterBankInfo::ValueMapping X86GenRegisterBankInfo::ValMappings[]{
INSTR_3OP(BREAKDOWN(PMI_VEC128, 1)) // 18: Vec128
INSTR_3OP(BREAKDOWN(PMI_VEC256, 1)) // 21: Vec256
INSTR_3OP(BREAKDOWN(PMI_VEC512, 1)) // 24: Vec512
+ INSTR_3OP(BREAKDOWN(PMI_PSR32, 1)) // 25: Rfp32
+ INSTR_3OP(BREAKDOWN(PMI_PSR64, 1)) // 26: Rfp64
+ INSTR_3OP(BREAKDOWN(PMI_PSR80, 1)) // 27: Rfp80
};
#undef INSTR_3OP
#undef BREAKDOWN
@@ -78,6 +88,9 @@ enum ValueMappingIdx {
VMI_3OpsVec128Idx = PMI_VEC128 * 3,
VMI_3OpsVec256Idx = PMI_VEC256 * 3,
VMI_3OpsVec512Idx = PMI_VEC512 * 3,
+ VMI_3OpsPs32Idx = PMI_PSR32 * 3,
+ VMI_3OpsPs64Idx = PMI_PSR64 * 3,
+ VMI_3OpsPs80Idx = PMI_PSR80 * 3,
};
#undef GET_TARGET_REGBANK_INFO_CLASS
#endif // GET_TARGET_REGBANK_INFO_CLASS
@@ -89,7 +102,7 @@ X86GenRegisterBankInfo::getValueMapping(PartialMappingIdx Idx,
unsigned NumOperands) {
// We can use VMI_3Ops Mapping for all the cases.
- if (NumOperands <= 3 && (Idx >= PMI_GPR8 && Idx <= PMI_VEC512))
+ if (NumOperands <= 3 && (Idx >= PMI_GPR8 && Idx <= PMI_PSR80))
return &ValMappings[(unsigned)Idx * 3];
llvm_unreachable("Unsupported PartialMappingIdx.");
diff --git a/llvm/lib/Target/X86/X86RegisterBanks.td b/llvm/lib/Target/X86/X86RegisterBanks.td
index 91a49725259543..05aa880bc6cb28 100644
--- a/llvm/lib/Target/X86/X86RegisterBanks.td
+++ b/llvm/lib/Target/X86/X86RegisterBanks.td
@@ -14,3 +14,6 @@ def GPRRegBank : RegisterBank<"GPR", [GR64]>;
/// Floating Point/Vector Registers
def VECRRegBank : RegisterBank<"VECR", [VR512]>;
+
+/// Pseudo Registers: RFP80
+def PSRRegBank : RegisterBank<"PSR", [RFP32, RFP64, RFP80]>;
diff --git a/llvm/test/CodeGen/X86/GlobalISel/regbankselect-x87.ll b/llvm/test/CodeGen/X86/GlobalISel/regbankselect-x87.ll
new file mode 100644
index 00000000000000..49343022f4c0ee
--- /dev/null
+++ b/llvm/test/CodeGen/X86/GlobalISel/regbankselect-x87.ll
@@ -0,0 +1,237 @@
+; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 4
+; RUN: llc < %s -mtriple=i686-- -mattr=+x87,-sse,-sse2 -global-isel -stop-after=regbankselect | FileCheck %s --check-prefix=X32
+; RUN: llc < %s -mtriple=x86_64-- -mattr=+x87,-sse,-sse2 -global-isel -stop-after=regbankselect | FileCheck %s --check-prefix=X64
+
+define x86_fp80 @f0(x86_fp80 noundef %a) {
+ ; X32-LABEL: name: f0
+ ; X32: bb.1.entry:
+ ; X32-NEXT: [[FRAME_INDEX:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.0
+ ; X32-NEXT: [[LOAD:%[0-9]+]]:psr(s80) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load (s80) from %fixed-stack.0, align 4)
+ ; X32-NEXT: [[C:%[0-9]+]]:psr(s80) = G_FCONSTANT x86_fp80 0xK400A8000000000000000
+ ; X32-NEXT: [[FRAME_INDEX1:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %stack.0.a.addr
+ ; X32-NEXT: [[FRAME_INDEX2:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %stack.1.x
+ ; X32-NEXT: G_STORE [[LOAD]](s80), [[FRAME_INDEX1]](p0) :: (store (s80) into %ir.a.addr, align 16)
+ ; X32-NEXT: G_STORE [[C]](s80), [[FRAME_INDEX2]](p0) :: (store (s80) into %ir.x, align 16)
+ ; X32-NEXT: [[LOAD1:%[0-9]+]]:psr(s80) = G_LOAD [[FRAME_INDEX1]](p0) :: (dereferenceable load (s80) from %ir.a.addr, align 16)
+ ; X32-NEXT: [[LOAD2:%[0-9]+]]:psr(s80) = G_LOAD [[FRAME_INDEX2]](p0) :: (dereferenceable load (s80) from %ir.x, align 16)
+ ; X32-NEXT: [[FADD:%[0-9]+]]:psr(s80) = G_FADD [[LOAD1]], [[LOAD2]]
+ ; X32-NEXT: $fp0 = COPY [[FADD]](s80)
+ ; X32-NEXT: RET 0, implicit $fp0
+ ;
+ ; X64-LABEL: name: f0
+ ; X64: bb.1.entry:
+ ; X64-NEXT: [[FRAME_INDEX:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.0
+ ; X64-NEXT: [[LOAD:%[0-9]+]]:psr(s80) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load (s80) from %fixed-stack.0, align 16)
+ ; X64-NEXT: [[C:%[0-9]+]]:psr(s80) = G_FCONSTANT x86_fp80 0xK400A8000000000000000
+ ; X64-NEXT: [[FRAME_INDEX1:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %stack.0.a.addr
+ ; X64-NEXT: [[FRAME_INDEX2:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %stack.1.x
+ ; X64-NEXT: G_STORE [[LOAD]](s80), [[FRAME_INDEX1]](p0) :: (store (s80) into %ir.a.addr, align 16)
+ ; X64-NEXT: G_STORE [[C]](s80), [[FRAME_INDEX2]](p0) :: (store (s80) into %ir.x, align 16)
+ ; X64-NEXT: [[LOAD1:%[0-9]+]]:psr(s80) = G_LOAD [[FRAME_INDEX1]](p0) :: (dereferenceable load (s80) from %ir.a.addr, align 16)
+ ; X64-NEXT: [[LOAD2:%[0-9]+]]:psr(s80) = G_LOAD [[FRAME_INDEX2]](p0) :: (dereferenceable load (s80) from %ir.x, align 16)
+ ; X64-NEXT: [[FADD:%[0-9]+]]:psr(s80) = G_FADD [[LOAD1]], [[LOAD2]]
+ ; X64-NEXT: $fp0 = COPY [[FADD]](s80)
+ ; X64-NEXT: RET 0, implicit $fp0
+entry:
+ %a.addr = alloca x86_fp80, align 16
+ %x = alloca x86_fp80, align 16
+ store x86_fp80 %a, ptr %a.addr, align 16
+ store x86_fp80 0xK400A8000000000000000, ptr %x, align 16
+ %0 = load x86_fp80, ptr %a.addr, align 16
+ %1 = load x86_fp80, ptr %x, align 16
+ %add = fadd x86_fp80 %0, %1
+ ret x86_fp80 %add
+}
+
+declare x86_fp80 @llvm.sqrt.f32(x86_fp80)
+
+define void @f1(ptr %a, ptr %b) {
+ ; X32-LABEL: name: f1
+ ; X32: bb.1 (%ir-block.0):
+ ; X32-NEXT: [[FRAME_INDEX:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.1
+ ; X32-NEXT: [[LOAD:%[0-9]+]]:gpr(p0) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load (p0) from %fixed-stack.1)
+ ; X32-NEXT: [[FRAME_INDEX1:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.0
+ ; X32-NEXT: [[LOAD1:%[0-9]+]]:gpr(p0) = G_LOAD [[FRAME_INDEX1]](p0) :: (invariant load (p0) from %fixed-stack.0)
+ ; X32-NEXT: [[LOAD2:%[0-9]+]]:psr(s80) = G_LOAD [[LOAD]](p0) :: (load (s80) from %ir.a, align 4)
+ ; X32-NEXT: [[LOAD3:%[0-9]+]]:psr(s80) = G_LOAD [[LOAD1]](p0) :: (load (s80) from %ir.b, align 4)
+ ; X32-NEXT: [[FSUB:%[0-9]+]]:psr(s80) = G_FSUB [[LOAD2]], [[LOAD3]]
+ ; X32-NEXT: G_STORE [[FSUB]](s80), [[LOAD]](p0) :: (store (s80) into %ir.a, align 4)
+ ; X32-NEXT: RET 0
+ ;
+ ; X64-LABEL: name: f1
+ ; X64: bb.1 (%ir-block.0):
+ ; X64-NEXT: liveins: $rdi, $rsi
+ ; X64-NEXT: {{ $}}
+ ; X64-NEXT: [[COPY:%[0-9]+]]:gpr(p0) = COPY $rdi
+ ; X64-NEXT: [[COPY1:%[0-9]+]]:gpr(p0) = COPY $rsi
+ ; X64-NEXT: [[LOAD:%[0-9]+]]:psr(s80) = G_LOAD [[COPY]](p0) :: (load (s80) from %ir.a, align 4)
+ ; X64-NEXT: [[LOAD1:%[0-9]+]]:psr(s80) = G_LOAD [[COPY1]](p0) :: (load (s80) from %ir.b, align 4)
+ ; X64-NEXT: [[FSUB:%[0-9]+]]:psr(s80) = G_FSUB [[LOAD]], [[LOAD1]]
+ ; X64-NEXT: G_STORE [[FSUB]](s80), [[COPY]](p0) :: (store (s80) into %ir.a, align 4)
+ ; X64-NEXT: RET 0
+ %1 = load x86_fp80, ptr %a, align 4
+ %2 = load x86_fp80, ptr %b, align 4
+ %sub = fsub x86_fp80 %1, %2
+ store x86_fp80 %sub, ptr %a, align 4
+ ret void
+}
+
+define void @f2(ptr %a, ptr %b) {
+ ; X32-LABEL: name: f2
+ ; X32: bb.1 (%ir-block.0):
+ ; X32-NEXT: [[FRAME_INDEX:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.1
+ ; X32-NEXT: [[LOAD:%[0-9]+]]:gpr(p0) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load (p0) from %fixed-stack.1)
+ ; X32-NEXT: [[FRAME_INDEX1:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.0
+ ; X32-NEXT: [[LOAD1:%[0-9]+]]:gpr(p0) = G_LOAD [[FRAME_INDEX1]](p0) :: (invariant load (p0) from %fixed-stack.0)
+ ; X32-NEXT: [[LOAD2:%[0-9]+]]:psr(s80) = G_LOAD [[LOAD]](p0) :: (load (s80) from %ir.a, align 16)
+ ; X32-NEXT: [[LOAD3:%[0-9]+]]:psr(s80) = G_LOAD [[LOAD1]](p0) :: (load (s80) from %ir.b, align 16)
+ ; X32-NEXT: [[FMUL:%[0-9]+]]:psr(s80) = G_FMUL [[LOAD2]], [[LOAD3]]
+ ; X32-NEXT: G_STORE [[FMUL]](s80), [[LOAD]](p0) :: (store (s80) into %ir.a, align 16)
+ ; X32-NEXT: RET 0
+ ;
+ ; X64-LABEL: name: f2
+ ; X64: bb.1 (%ir-block.0):
+ ; X64-NEXT: liveins: $rdi, $rsi
+ ; X64-NEXT: {{ $}}
+ ; X64-NEXT: [[COPY:%[0-9]+]]:gpr(p0) = COPY $rdi
+ ; X64-NEXT: [[COPY1:%[0-9]+]]:gpr(p0) = COPY $rsi
+ ; X64-NEXT: [[LOAD:%[0-9]+]]:psr(s80) = G_LOAD [[COPY]](p0) :: (load (s80) from %ir.a, align 16)
+ ; X64-NEXT: [[LOAD1:%[0-9]+]]:psr(s80) = G_LOAD [[COPY1]](p0) :: (load (s80) from %ir.b, align 16)
+ ; X64-NEXT: [[FMUL:%[0-9]+]]:psr(s80) = G_FMUL [[LOAD]], [[LOAD1]]
+ ; X64-NEXT: G_STORE [[FMUL]](s80), [[COPY]](p0) :: (store (s80) into %ir.a, align 16)
+ ; X64-NEXT: RET 0
+ %1 = load x86_fp80, ptr %a, align 16
+ %2 = load x86_fp80, ptr %b, align 16
+ %mul = fmul x86_fp80 %1, %2
+ store x86_fp80 %mul, ptr %a, align 16
+ ret void
+}
+
+define void @f3(ptr %a, ptr %b) {
+ ; X32-LABEL: name: f3
+ ; X32: bb.1 (%ir-block.0):
+ ; X32-NEXT: [[FRAME_INDEX:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.1
+ ; X32-NEXT: [[LOAD:%[0-9]+]]:gpr(p0) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load (p0) from %fixed-stack.1)
+ ; X32-NEXT: [[FRAME_INDEX1:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.0
+ ; X32-NEXT: [[LOAD1:%[0-9]+]]:gpr(p0) = G_LOAD [[FRAME_INDEX1]](p0) :: (invariant load (p0) from %fixed-stack.0)
+ ; X32-NEXT: [[LOAD2:%[0-9]+]]:psr(s80) = G_LOAD [[LOAD]](p0) :: (load (s80) from %ir.a, align 4)
+ ; X32-NEXT: [[LOAD3:%[0-9]+]]:psr(s80) = G_LOAD [[LOAD1]](p0) :: (load (s80) from %ir.b, align 4)
+ ; X32-NEXT: [[FDIV:%[0-9]+]]:psr(s80) = G_FDIV [[LOAD2]], [[LOAD3]]
+ ; X32-NEXT: G_STORE [[FDIV]](s80), [[LOAD]](p0) :: (store (s80) into %ir.a, align 4)
+ ; X32-NEXT: RET 0
+ ;
+ ; X64-LABEL: name: f3
+ ; X64: bb.1 (%ir-block.0):
+ ; X64-NEXT: liveins: $rdi, $rsi
+ ; X64-NEXT: {{ $}}
+ ; X64-NEXT: [[COPY:%[0-9]+]]:gpr(p0) = COPY $rdi
+ ; X64-NEXT: [[COPY1:%[0-9]+]]:gpr(p0) = COPY $rsi
+ ; X64-NEXT: [[LOAD:%[0-9]+]]:psr(s80) = G_LOAD [[COPY]](p0) :: (load (s80) from %ir.a, align 4)
+ ; X64-NEXT: [[LOAD1:%[0-9]+]]:psr(s80) = G_LOAD [[COPY1]](p0) :: (load (s80) from %ir.b, align 4)
+ ; X64-NEXT: [[FDIV:%[0-9]+]]:psr(s80) = G_FDIV [[LOAD]], [[LOAD1]]
+ ; X64-NEXT: G_STORE [[FDIV]](s80), [[COPY]](p0) :: (store (s80) into %ir.a, align 4)
+ ; X64-NEXT: RET 0
+ %1 = load x86_fp80, ptr %a, align 4
+ %2 = load x86_fp80, ptr %b, align 4
+ %div = fdiv x86_fp80 %1, %2
+ store x86_fp80 %div, ptr %a, align 4
+ ret void
+}
+
+define float @f4(float %val) {
+ ; X32-LABEL: name: f4
+ ; X32: bb.1 (%ir-block.0):
+ ; X32-NEXT: [[FRAME_INDEX:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.0
+ ; X32-NEXT: [[LOAD:%[0-9]+]]:gpr(s32) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load (s32) from %fixed-stack.0)
+ ; X32-NEXT: $fp0 = COPY [[LOAD]](s32)
+ ; X32-NEXT: RET 0, implicit $fp0
+ ;
+ ; X64-LABEL: name: f4
+ ; X64: bb.1 (%ir-block.0):
+ ; X64-NEXT: [[FRAME_INDEX:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.0
+ ; X64-NEXT: [[LOAD:%[0-9]+]]:gpr(s32) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load (s32) from %fixed-stack.0, align 16)
+ ; X64-NEXT: $xmm0 = COPY [[LOAD]](s32)
+ ; X64-NEXT: RET 0, implicit $xmm0
+ ret float %val
+}
+
+define void @f5(ptr %a, ptr %b) {
+ ; X32-LABEL: name: f5
+ ; X32: bb.1 (%ir-block.0):
+ ; X32-NEXT: [[FRAME_INDEX:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.1
+ ; X32-NEXT: [[LOAD:%[0-9]+]]:gpr(p0) = G_LOAD [[FRAME_INDEX]](p0) :: (invariant load (p0) from %fixed-stack.1)
+ ; X32-NEXT: [[FRAME_INDEX1:%[0-9]+]]:gpr(p0) = G_FRAME_INDEX %fixed-stack.0
+ ; X32-NEXT: [[LOAD1:%[0-9]+]]:gpr(p0) = G_LOAD [[FRAME_INDEX1]](p0) :: (invariant load (p0) from %fixed-stack.0)
+ ; X32-NEXT: [[LOAD2:%[0-9]+]]:gpr(s32) = G_LOAD [[LOAD]](p0) :: (load (s32) from %ir.a, align 8)
+ ; X32-NEXT: [[C:%[0-9]+]]:gpr(s32) = G_CONSTANT i32 4
+ ; X32-NEXT: [[PTR_ADD:%[0-9]+]]:gpr(p0) = G_PTR_ADD [[LOAD]], [[C]](s32)
+ ; X32-NEXT: [[COPY:%[0-9]+]]:gpr(p0) = COPY [[PTR_ADD]](p0)
+ ; X32-NEXT: [[LOAD3:%[0-9]+]]:gpr(s32) = G_LOAD [[COPY]](p0) :: (load (s32) from %ir.a + 4, basealign 8)
+ ; X32-NEXT: [[MV:%[0-9]+]]:gpr(s64) = G_MERGE_VALUES [[LOAD2]](s32), [[LOAD3]](s32)
+ ; X32-NEXT: [[LOAD4:%[0-9]+]]:gpr(s32) = G_LOAD [[LOAD1]](p0) :: (load (s32) from %ir.b, align 8)
+ ; X32-NEXT: [[PTR_ADD1:%[0-9]+]]:gpr(p0) = G_PTR_ADD [[LOAD1]], [[C]](s32)
+ ; X32-NEXT: [[LOAD5:%[0-9]+]]:gpr(s32) = G_LOAD [[PTR_ADD1]](p0) :: (load (s32) from %ir.b + 4, basealign 8)
+ ; X32-NEXT: [[MV1:%[0-9]+]]:gpr(s64) = G_MERGE_VALUES [[LOAD4]](s32), [[LOAD5]](s32)
+ ; X32-NEXT: ...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/83528
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