[llvm] [CodeGen][MachineVerifier] Use TypeSize instead of unsigned for getRe… (PR #70881)
Michael Maitland via llvm-commits
llvm-commits at lists.llvm.org
Thu Nov 2 19:30:55 PDT 2023
https://github.com/michaelmaitland updated https://github.com/llvm/llvm-project/pull/70881
>From 8c0577af1a68b51e57b36bbe5b63837f402ad600 Mon Sep 17 00:00:00 2001
From: Michael Maitland <michaeltmaitland at gmail.com>
Date: Tue, 31 Oct 2023 18:33:47 -0700
Subject: [PATCH 1/4] [CodeGen][MachineVerifier] Use TypeSize instead of
unsigned for getRegSizeInBits
This patch changes getRegSizeInBits to return a TypeSize instead of an
unsigned in the case that a virtual register has a scalable LLT. In the
case that register is physical, a Fixed TypeSize is returned.
The MachineVerifier pass is updated to allow copies between fixed and
scalable operands as long as the Src size will fit into the Dest size.
This is a precommit which will be stacked on by a change to GISel to
generate COPYs with a scalable destination but a fixed size source.
---
.../include/llvm/CodeGen/TargetRegisterInfo.h | 6 ++---
llvm/lib/CodeGen/MachineVerifier.cpp | 22 ++++++++++++++-----
llvm/lib/CodeGen/TargetRegisterInfo.cpp | 19 ++++++++--------
3 files changed, 29 insertions(+), 18 deletions(-)
diff --git a/llvm/include/llvm/CodeGen/TargetRegisterInfo.h b/llvm/include/llvm/CodeGen/TargetRegisterInfo.h
index 337fab735a09522..4fb6ba7c26930af 100644
--- a/llvm/include/llvm/CodeGen/TargetRegisterInfo.h
+++ b/llvm/include/llvm/CodeGen/TargetRegisterInfo.h
@@ -283,8 +283,8 @@ class TargetRegisterInfo : public MCRegisterInfo {
// DenseMapInfo<unsigned> uses -1u and -2u.
/// Return the size in bits of a register from class RC.
- unsigned getRegSizeInBits(const TargetRegisterClass &RC) const {
- return getRegClassInfo(RC).RegSize;
+ TypeSize getRegSizeInBits(const TargetRegisterClass &RC) const {
+ return TypeSize::Fixed(getRegClassInfo(RC).RegSize);
}
/// Return the size in bytes of the stack slot allocated to hold a spilled
@@ -858,7 +858,7 @@ class TargetRegisterInfo : public MCRegisterInfo {
const TargetRegisterClass *RC) const = 0;
/// Returns size in bits of a phys/virtual/generic register.
- unsigned getRegSizeInBits(Register Reg, const MachineRegisterInfo &MRI) const;
+ TypeSize getRegSizeInBits(Register Reg, const MachineRegisterInfo &MRI) const;
/// Get the weight in units of pressure for this register unit.
virtual unsigned getRegUnitWeight(unsigned RegUnit) const = 0;
diff --git a/llvm/lib/CodeGen/MachineVerifier.cpp b/llvm/lib/CodeGen/MachineVerifier.cpp
index dadaf60fa09da04..9837a93d8339974 100644
--- a/llvm/lib/CodeGen/MachineVerifier.cpp
+++ b/llvm/lib/CodeGen/MachineVerifier.cpp
@@ -1937,8 +1937,9 @@ void MachineVerifier::visitMachineInstrBefore(const MachineInstr *MI) {
// If we have only one valid type, this is likely a copy between a virtual
// and physical register.
- unsigned SrcSize = 0;
- unsigned DstSize = 0;
+ TypeSize SrcSize = TRI->getRegSizeInBits(SrcReg, *MRI);
+ TypeSize DstSize = TRI->getRegSizeInBits(DstReg, *MRI);
+
if (SrcReg.isPhysical() && DstTy.isValid()) {
const TargetRegisterClass *SrcRC =
TRI->getMinimalPhysRegClassLLT(SrcReg, DstTy);
@@ -1946,7 +1947,7 @@ void MachineVerifier::visitMachineInstrBefore(const MachineInstr *MI) {
SrcSize = TRI->getRegSizeInBits(*SrcRC);
}
- if (SrcSize == 0)
+ if (SrcSize.isZero())
SrcSize = TRI->getRegSizeInBits(SrcReg, *MRI);
if (DstReg.isPhysical() && SrcTy.isValid()) {
@@ -1956,10 +1957,21 @@ void MachineVerifier::visitMachineInstrBefore(const MachineInstr *MI) {
DstSize = TRI->getRegSizeInBits(*DstRC);
}
- if (DstSize == 0)
+ if (DstSize.isZero())
DstSize = TRI->getRegSizeInBits(DstReg, *MRI);
- if (SrcSize != 0 && DstSize != 0 && SrcSize != DstSize) {
+ // If the Dst is scalable and the Src is fixed, then the Dst can only hold
+ // the Src if the minimum size Dst can hold is at least as big as Src.
+ if (DstSize.isScalable() && !SrcSize.isScalable() &&
+ DstSize.getKnownMinValue() <= SrcSize.getFixedValue())
+ break;
+ // If the Src is scalable and the Dst is fixed, then Dest can only hold
+ // the Src is known to fit in Dest
+ if (SrcSize.isScalable() && !DstSize.isScalable() &&
+ TypeSize::isKnownLE(DstSize, SrcSize))
+ break;
+
+ if (SrcSize.isNonZero() && DstSize.isNonZero() && SrcSize != DstSize) {
if (!DstOp.getSubReg() && !SrcOp.getSubReg()) {
report("Copy Instruction is illegal with mismatching sizes", MI);
errs() << "Def Size = " << DstSize << ", Src Size = " << SrcSize
diff --git a/llvm/lib/CodeGen/TargetRegisterInfo.cpp b/llvm/lib/CodeGen/TargetRegisterInfo.cpp
index 1bb35f40facfd0f..c50b1cf9422717a 100644
--- a/llvm/lib/CodeGen/TargetRegisterInfo.cpp
+++ b/llvm/lib/CodeGen/TargetRegisterInfo.cpp
@@ -499,7 +499,7 @@ bool TargetRegisterInfo::regmaskSubsetEqual(const uint32_t *mask0,
return true;
}
-unsigned
+TypeSize
TargetRegisterInfo::getRegSizeInBits(Register Reg,
const MachineRegisterInfo &MRI) const {
const TargetRegisterClass *RC{};
@@ -508,16 +508,15 @@ TargetRegisterInfo::getRegSizeInBits(Register Reg,
// Instead, we need to access a register class that contains Reg and
// get the size of that register class.
RC = getMinimalPhysRegClass(Reg);
- } else {
- LLT Ty = MRI.getType(Reg);
- unsigned RegSize = Ty.isValid() ? Ty.getSizeInBits() : 0;
- // If Reg is not a generic register, query the register class to
- // get its size.
- if (RegSize)
- return RegSize;
- // Since Reg is not a generic register, it must have a register class.
- RC = MRI.getRegClass(Reg);
+ assert(RC && "Unable to deduce the register class");
+ return getRegSizeInBits(*RC);
}
+ LLT Ty = MRI.getType(Reg);
+ if (Ty.isValid())
+ return Ty.getSizeInBits();
+
+ // Since Reg is not a generic register, it may have a register class.
+ RC = MRI.getRegClass(Reg);
assert(RC && "Unable to deduce the register class");
return getRegSizeInBits(*RC);
}
>From 7d1aaced6950cce52e35ff7550393ff9708bbaac Mon Sep 17 00:00:00 2001
From: Michael Maitland <michaeltmaitland at gmail.com>
Date: Tue, 31 Oct 2023 18:57:14 -0700
Subject: [PATCH 2/4] Avoid duplicate computation
---
llvm/lib/CodeGen/MachineVerifier.cpp | 7 -------
1 file changed, 7 deletions(-)
diff --git a/llvm/lib/CodeGen/MachineVerifier.cpp b/llvm/lib/CodeGen/MachineVerifier.cpp
index 9837a93d8339974..ca0c963a7aa7158 100644
--- a/llvm/lib/CodeGen/MachineVerifier.cpp
+++ b/llvm/lib/CodeGen/MachineVerifier.cpp
@@ -1939,7 +1939,6 @@ void MachineVerifier::visitMachineInstrBefore(const MachineInstr *MI) {
// and physical register.
TypeSize SrcSize = TRI->getRegSizeInBits(SrcReg, *MRI);
TypeSize DstSize = TRI->getRegSizeInBits(DstReg, *MRI);
-
if (SrcReg.isPhysical() && DstTy.isValid()) {
const TargetRegisterClass *SrcRC =
TRI->getMinimalPhysRegClassLLT(SrcReg, DstTy);
@@ -1947,9 +1946,6 @@ void MachineVerifier::visitMachineInstrBefore(const MachineInstr *MI) {
SrcSize = TRI->getRegSizeInBits(*SrcRC);
}
- if (SrcSize.isZero())
- SrcSize = TRI->getRegSizeInBits(SrcReg, *MRI);
-
if (DstReg.isPhysical() && SrcTy.isValid()) {
const TargetRegisterClass *DstRC =
TRI->getMinimalPhysRegClassLLT(DstReg, SrcTy);
@@ -1957,9 +1953,6 @@ void MachineVerifier::visitMachineInstrBefore(const MachineInstr *MI) {
DstSize = TRI->getRegSizeInBits(*DstRC);
}
- if (DstSize.isZero())
- DstSize = TRI->getRegSizeInBits(DstReg, *MRI);
-
// If the Dst is scalable and the Src is fixed, then the Dst can only hold
// the Src if the minimum size Dst can hold is at least as big as Src.
if (DstSize.isScalable() && !SrcSize.isScalable() &&
>From 166017cfb1958a842f80a5363452917b985cbd61 Mon Sep 17 00:00:00 2001
From: Michael Maitland <michaeltmaitland at gmail.com>
Date: Tue, 31 Oct 2023 20:39:46 -0700
Subject: [PATCH 3/4] Add MachineVerifier test case
---
llvm/test/MachineVerifier/copy-scalable.mir | 23 +++++++++++++++++++++
1 file changed, 23 insertions(+)
create mode 100644 llvm/test/MachineVerifier/copy-scalable.mir
diff --git a/llvm/test/MachineVerifier/copy-scalable.mir b/llvm/test/MachineVerifier/copy-scalable.mir
new file mode 100644
index 000000000000000..f4088f7aed34dde
--- /dev/null
+++ b/llvm/test/MachineVerifier/copy-scalable.mir
@@ -0,0 +1,23 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 3
+# RUN: llc -mtriple=riscv64 -o - -global-isel -run-pass=none -verify-machineinstrs %s | FileCheck %s
+# REQUIRES: riscv64-registered-target
+
+---
+name: test_copy_fixed_to_scalable
+legalized: true
+regBankSelected: false
+selected: false
+tracksRegLiveness: true
+registers:
+ - { id: 0, class: _, preferred-register: '' }
+liveins:
+body: |
+ bb.0:
+ liveins: $v8
+
+ ; CHECK-LABEL: name: test_copy_fixed_to_scalable
+ ; CHECK: liveins: $v8
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(<vscale x 1 x s8>) = COPY $v8
+ %0:_(<vscale x 1 x s8>) = COPY $v8
+...
>From 0f0e8ab6e24e5f099281be3100ab3f111c234c9b Mon Sep 17 00:00:00 2001
From: Michael Maitland <michaeltmaitland at gmail.com>
Date: Tue, 31 Oct 2023 20:50:07 -0700
Subject: [PATCH 4/4] fix failing test
---
llvm/test/CodeGen/RISCV/GlobalISel/irtranslator/fallback.ll | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/llvm/test/CodeGen/RISCV/GlobalISel/irtranslator/fallback.ll b/llvm/test/CodeGen/RISCV/GlobalISel/irtranslator/fallback.ll
index 5dd62de8a6bc415..a3a913d8ce02d83 100644
--- a/llvm/test/CodeGen/RISCV/GlobalISel/irtranslator/fallback.ll
+++ b/llvm/test/CodeGen/RISCV/GlobalISel/irtranslator/fallback.ll
@@ -22,7 +22,7 @@ entry:
ret <vscale x 1 x i8> %a
}
-; FALLBACK-WITH-REPORT-ERR: remark: <unknown>:0:0: unable to translate instruction{{.*}}scalable_inst
+; FALLBACK-WITH-REPORT-ERR: remark: <unknown>:0:0: unable to translate instruction: call:
; FALLBACK-WITH-REPORT-OUT-LABEL: scalable_inst
define <vscale x 1 x i8> @scalable_inst(i64 %0) nounwind {
entry:
@@ -35,7 +35,7 @@ entry:
ret <vscale x 1 x i8> %a
}
-; FALLBACK-WITH-REPORT-ERR: remark: <unknown>:0:0: unable to translate instruction{{.*}}scalable_alloca
+; FALLBACK-WITH-REPORT-ERR: remark: <unknown>:0:0: unable to translate instruction: alloca:
; FALLBACK-WITH-REPORT-OUT-LABEL: scalable_alloca
define void @scalable_alloca() #1 {
%local0 = alloca <vscale x 16 x i8>
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