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[GlobalISel] Catching inconsistencies in load memory, result, and range metadata type #121247

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Merged
arsenm merged 21 commits into from
Jan 28, 2025
Merged

[GlobalISel] Catching inconsistencies in load memory, result, and range metadata type #121247

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Catching inconsistencies in load memory, result, and range metadata type
parsifal-47 Dec 28, 2024
b76c3df
Moving test case to proper location
parsifal-47 Jan 5, 2025
b740e22
Addressing review feedback
parsifal-47 Jan 6, 2025
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parsifal-47 Jan 6, 2025
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Update llvm/test/MachineVerifier/test_g_load_vector_to_scalar.mir
parsifal-47 Jan 9, 2025
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Update llvm/lib/CodeGen/MachineVerifier.cpp
parsifal-47 Jan 9, 2025
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Addressing review feedback
parsifal-47 Jan 10, 2025
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Formatting
parsifal-47 Jan 10, 2025
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Update llvm/test/MachineVerifier/test_g_incompatible_range.mir
parsifal-47 Jan 15, 2025
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Update llvm/test/MachineVerifier/test_g_incompatible_range.mir
parsifal-47 Jan 15, 2025
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Update llvm/lib/CodeGen/MachineVerifier.cpp
parsifal-47 Jan 15, 2025
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Update llvm/test/MachineVerifier/test_g_incompatible_range.mir
parsifal-47 Jan 15, 2025
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Update llvm/test/MachineVerifier/test_g_incompatible_range.mir
parsifal-47 Jan 15, 2025
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Formatting
parsifal-47 Jan 15, 2025
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Addressing review feedback
parsifal-47 Jan 17, 2025
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Update llvm/lib/CodeGen/MachineVerifier.cpp
parsifal-47 Jan 22, 2025
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Reverting changes to the testcases
parsifal-47 Jan 22, 2025
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Fix failing test
parsifal-47 Jan 23, 2025
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Update error message in the tests
parsifal-47 Jan 24, 2025
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Fixing the build
parsifal-47 Jan 24, 2025
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parsifal-47 Jan 24, 2025
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2 changes: 1 addition & 1 deletion llvm/lib/CodeGen/MachineVerifier.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1279,7 +1279,7 @@ void MachineVerifier::verifyPreISelGenericInstruction(const MachineInstr *MI) {
ConstantInt *i =
mdconst::extract<ConstantInt>(MMO.getRanges()->getOperand(0));
if (i->getIntegerType()->getBitWidth() !=
MMO.getMemoryType().getScalarSizeInBits()) {
ValTy.getScalarType().getSizeInBits()) {
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@arsenm arsenm Jan 21, 2025

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Suggested change
ValTy.getScalarType().getSizeInBits()) {
MMO.getMemoryType().getScalarSizeInBits()) {

This should continue to permit the extending load case to use range metadata. Verifying the result type is trickier since we need to account for valid extending loads

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@arsenm arsenm Jan 29, 2025

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The change to use the memory type got lost

report("range is incompatible with the result type", MI);
}
}
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3 changes: 2 additions & 1 deletion llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-load-memory-metadata.mir
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Expand Up @@ -30,6 +30,7 @@
!0 = !{i24 0, i24 1048575}
!1 = !{!"omnipotent char", !2}
!2 = !{!"Simple C/C++ TBAA"}
!3 = !{i32 0, i32 1048575}
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@arsenm arsenm Jan 16, 2025

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This shouldn't touch the input IR. However this makes me realize we are violating the principle that we shouldn't touch the underlying IR in codegen. I guess global metadata constants could be an exception

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@parsifal-47 parsifal-47 Jan 17, 2025

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sorry, I do not understand how to resolve the comment, this test started to fail because i24 range is used on i32 value, I have forked this range with i32 to make the test pass, should I change this test or should I change the check? Thank you!

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@arsenm arsenm Jan 21, 2025

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I guess it depends how we want to handle extending loads. As written, I think we should leave the test for now. However that means you need to adjust from checking the result memory type, to the memory type in the MachineMemOperand

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@parsifal-47 parsifal-47 Jan 22, 2025

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got it, thank you!

...

# Make sure range metadata is not preserved when widening loads, but
Expand Down Expand Up @@ -67,7 +68,7 @@ body: |
; SI-NEXT: [[LOAD:%[0-9]+]]:_(s32) = G_LOAD [[COPY]](p1) :: (load (s32), !tbaa !1, addrspace 1)
; SI-NEXT: $vgpr0 = COPY [[LOAD]](s32)
%0:_(p1) = COPY $vgpr0_vgpr1
%1:_(s32) = G_LOAD %0 :: (load (s24), align 4, addrspace 1, !range !0, !tbaa !1)
%1:_(s32) = G_LOAD %0 :: (load (s24), align 4, addrspace 1, !range !3, !tbaa !1)
$vgpr0 = COPY %1

...
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4 changes: 1 addition & 3 deletions llvm/test/MachineVerifier/test_g_incompatible_range.mir
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@@ -1,4 +1,4 @@
# RUN: not --crash llc -mtriple=amdgcn-mesa-mesa3d -mcpu=tahiti -run-pass=none %s -filetype=null 2>&1 | FileCheck %s
# RUN: not --crash llc -o - -mtriple=amdgcn-mesa-mesa3d -mcpu=tahiti -run-pass=none %s 2>&1 | FileCheck %s
--- |
define void @mismatched_range_type() {
ret void
Expand All @@ -21,10 +21,8 @@ body: |
; CHECK: Bad machine code: range is incompatible with the result type
%3:_(<2 x s32>) = G_LOAD %0(p1) :: (volatile load (s64), align 4, !range !0, addrspace 1)

; CHECK: Bad machine code: range is incompatible with the result type
%4:_(p0) = G_LOAD %0(p1) :: (volatile load (s64), align 4, !range !0, addrspace 1)

; CHECK: Bad machine code: range is incompatible with the result type
%5:_(<2 x p0>) = G_LOAD %0(p1) :: (volatile load (s64), align 4, !range !0, addrspace 1)

$vgpr0_vgpr1 = COPY %3
Expand Down
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