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[GlobalISel] support lowering of G_SHUFFLEVECTOR with pointer args #141959
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[GlobalISel] support lowering of G_SHUFFLEVECTOR with pointer args #141959
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@llvm/pr-subscribers-backend-amdgpu @llvm/pr-subscribers-llvm-globalisel Author: Stanley Gambarin (stanleygambarin) ChangesFull diff: https://github.com/llvm/llvm-project/pull/141959.diff 2 Files Affected:
diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index 7b18a98d7f3ca..83ba71e4c9d49 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -8446,10 +8446,10 @@ LegalizerHelper::lowerShuffleVector(MachineInstr &MI) {
}
}
- if (DstTy.isScalar())
- MIRBuilder.buildCopy(DstReg, BuildVec[0]);
- else
+ if (DstTy.isVector())
MIRBuilder.buildBuildVector(DstReg, BuildVec);
+ else
+ MIRBuilder.buildCopy(DstReg, BuildVec[0]);
MI.eraseFromParent();
return Legalized;
}
diff --git a/llvm/test/CodeGen/AMDGPU/shufflevector-pointer-crash.mir b/llvm/test/CodeGen/AMDGPU/shufflevector-pointer-crash.mir
new file mode 100644
index 0000000000000..03b870b923454
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/shufflevector-pointer-crash.mir
@@ -0,0 +1,21 @@
+# RUN: llc -march=amdgcn -run-pass=legalizer -verify-machineinstrs %s -o -
+
+--- |
+ define i32 @test(i64 %arg) {
+ ret i32 0
+ }
+...
+name: test
+tracksRegLiveness: true
+body: |
+ bb.0:
+ %9:_(p0) = G_CONSTANT i64 0
+ %10:_(<2 x p0>) = G_BUILD_VECTOR %9:_(p0), %9:_(p0)
+ %8:_(<2 x p0>) = G_LOAD %9:_(p0) :: (load (<2 x p0>) from `ptr null`, align 64)
+ %11:_(p0) = G_SHUFFLE_VECTOR %8:_(<2 x p0>), %10:_, shufflemask(0)
+ %12:_(s32), %13:_(s32) = G_UNMERGE_VALUES %11:_(p0)
+ $vgpr0 = COPY %12:_(s32)
+ $vgpr1 = COPY %13:_(s32)
+ SI_RETURN implicit $vgpr0, implicit $vgpr1
+...
+
|
@@ -0,0 +1,21 @@ | |||
# RUN: llc -march=amdgcn -run-pass=legalizer -verify-machineinstrs %s -o - |
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Can you include an IR test? Can we just add global-isel run lines to the existing shuffle vector tests?
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unfortunately, no. AMD backend will replace G_SHUFFLEVECTOR is pre-legalizer pass (even with -O0), so the fixed code path never gets hit. Have to resort to using MIR test to demonstrate the problem.
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@stanleygambarin Thanks for working on this! LGTM! I can merge the PR if the patch is ready.
@stanleygambarin Congratulations on having your first Pull Request (PR) merged into the LLVM Project! Your changes will be combined with recent changes from other authors, then tested by our build bots. If there is a problem with a build, you may receive a report in an email or a comment on this PR. Please check whether problems have been caused by your change specifically, as the builds can include changes from many authors. It is not uncommon for your change to be included in a build that fails due to someone else's changes, or infrastructure issues. How to do this, and the rest of the post-merge process, is covered in detail here. If your change does cause a problem, it may be reverted, or you can revert it yourself. This is a normal part of LLVM development. You can fix your changes and open a new PR to merge them again. If you don't get any reports, no action is required from you. Your changes are working as expected, well done! |
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