[DSE] Remove uninitialized from allockind when creating dummy zeroed variant function
#149336
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clubby789
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uninitialized from allockind when creating dummy zeroed variant functionuninitialized from allockind when creating dummy zeroed variant function
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@llvm/pr-subscribers-llvm-transforms Author: None (clubby789) Changescc #138299 rustc sets Full diff: https://github.com/llvm/llvm-project/pull/149336.diff 2 Files Affected:
diff --git a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
index 85dd9a1bf7161..0f63ed0166cf4 100644
--- a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -2079,6 +2079,7 @@ struct DSEState {
AllocFnKind AllocKind =
Attrs.getFnAttr(Attribute::AllocKind).getAllocKind() |
AllocFnKind::Zeroed;
+ AllocKind &= ~AllocFnKind::Uninitialized;
Attrs =
Attrs.addFnAttribute(Ctx, Attribute::getWithAllocKind(Ctx, AllocKind))
.removeFnAttribute(Ctx, "alloc-variant-zeroed");
diff --git a/llvm/test/Transforms/DeadStoreElimination/zeroed-missing.ll b/llvm/test/Transforms/DeadStoreElimination/zeroed-missing.ll
index e390d4bdca632..303afc207c023 100644
--- a/llvm/test/Transforms/DeadStoreElimination/zeroed-missing.ll
+++ b/llvm/test/Transforms/DeadStoreElimination/zeroed-missing.ll
@@ -12,6 +12,6 @@ define ptr @undeclared_customalloc(i64 %size, i64 %align) {
ret ptr %call
}
-declare ptr @customalloc2(i64, i64) allockind("alloc") "alloc-family"="customalloc2" "alloc-variant-zeroed"="customalloc2_zeroed"
+declare ptr @customalloc2(i64, i64) allockind("alloc,uninitialized") "alloc-family"="customalloc2" "alloc-variant-zeroed"="customalloc2_zeroed"
; CHECK-DAG: declare ptr @customalloc2_zeroed(i64, i64) #[[CA2ATTR:[0-9]+]]
; CHECK-DAG: attributes #[[CA2ATTR]] = { allockind("alloc,zeroed") "alloc-family"="customalloc2" }
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/cherry-pick 74c396a |
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/pull-request #149468 |
tru
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Jul 22, 2025
…oed variant function (llvm#149336) cc llvm#138299 rustc sets `allockind("uninitialized")` - if we copy the attributes as-is when creating a dummy function, Verify complains about `allockind("uninitialized,zeroed")` conflicting, so we need to clear the flag. Co-authored-by: Jamie Hill-Daniel <[email protected]> (cherry picked from commit 74c396a)
This was referenced Jul 23, 2025
bors
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Aug 19, 2025
Pass `alloc-variant-zeroed` to LLVM Makes use of llvm/llvm-project#138299 (once we pull in a version of LLVM with this attribute). ~~Unfortunately also requires llvm/llvm-project#149336 to work.~~ Closes #104847
bors
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Aug 20, 2025
Pass `alloc-variant-zeroed` to LLVM Makes use of llvm/llvm-project#138299 (once we pull in a version of LLVM with this attribute). ~~Unfortunately also requires llvm/llvm-project#149336 to work.~~ Closes #104847
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cc #138299
rustc sets
allockind("uninitialized")- if we copy the attributes as-is when creating a dummy function, Verify complains aboutallockind("uninitialized,zeroed")conflicting, so we need to clear the flag.