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release/19.x: [Inliner] Don't propagate access attr to byval params (#112256) #112365

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Oct 29, 2024
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release/19.x: [Inliner] Don't propagate access attr to byval params (#112256) #112365

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2 changes: 1 addition & 1 deletion llvm/lib/Transforms/Utils/InlineFunction.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1395,7 +1395,7 @@ static void AddParamAndFnBasicAttributes(const CallBase &CB,
if (!Arg)
continue;

if (AL.hasParamAttr(I, Attribute::ByVal))
if (NewInnerCB->paramHasAttr(I, Attribute::ByVal))
// It's unsound to propagate memory attributes to byval arguments.
// Even if CalledFunction doesn't e.g. write to the argument,
// the call to NewInnerCB may write to its by-value copy.
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20 changes: 20 additions & 0 deletions llvm/test/Transforms/Inline/access-attributes-prop.ll
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Expand Up @@ -580,3 +580,23 @@ define ptr @callee_bad_param_prop(ptr readonly %x) {
%r = tail call ptr @llvm.ptrmask(ptr %x, i64 -1)
ret ptr %r
}

define dso_local void @foo_byval_readonly2(ptr readonly %p) {
; CHECK-LABEL: define {{[^@]+}}@foo_byval_readonly2
; CHECK-SAME: (ptr readonly [[P:%.*]]) {
; CHECK-NEXT: call void @bar4(ptr [[P]])
; CHECK-NEXT: ret void
;
call void @bar4(ptr %p)
ret void
}

define void @prop_byval_readonly2(ptr %p) {
; CHECK-LABEL: define {{[^@]+}}@prop_byval_readonly2
; CHECK-SAME: (ptr [[P:%.*]]) {
; CHECK-NEXT: call void @bar4(ptr [[P]])
; CHECK-NEXT: ret void
;
call void @foo_byval_readonly2(ptr %p)
ret void
}
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