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InstCombine: Don't fold call bitcast into args if callee is byval

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This fixes a bug reported here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150309/265341.html

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231948 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer 2015-03-11 18:03:05 +00:00
parent c5860523be
commit 9c2d178707
2 changed files with 19 additions and 1 deletions
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5
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -1485,7 +1485,10 @@ bool InstCombiner::transformConstExprCastCall(CallSite CS) {
//
// into:
// call void @takes_i32_inalloca(i32* null)
if (Callee->getAttributes().hasAttrSomewhere(Attribute::InAlloca))
//
// Similarly, avoid folding away bitcasts of byval calls.
if (Callee->getAttributes().hasAttrSomewhere(Attribute::InAlloca) ||
Callee->getAttributes().hasAttrSomewhere(Attribute::ByVal))
return false;
CallSite::arg_iterator AI = CS.arg_begin();

15
test/Transforms/InstCombine/call-cast-target.ll
View File

@ -72,3 +72,18 @@ entry:
%call = tail call i32 bitcast (i32 (i32)* @fn4 to i32 (i32*)*)(i32* %a)
ret i32 %call
}
declare i1 @fn5({ i32, i32 }* byval align 4 %r)
define i1 @test5() {
; CHECK-LABEL: @test5
; CHECK: %[[call:.*]] = call i1 bitcast (i1 ({ i32, i32 }*)* @fn5 to i1 (i32, i32)*)(i32 {{.*}}, i32 {{.*}})
; CHECK-NEXT: ret i1 %[[call]]
%1 = alloca { i32, i32 }, align 4
%2 = getelementptr inbounds { i32, i32 }, { i32, i32 }* %1, i32 0, i32 0
%3 = load i32, i32* %2, align 4
%4 = getelementptr inbounds { i32, i32 }, { i32, i32 }* %1, i32 0, i32 1
%5 = load i32, i32* %4, align 4
%6 = call i1 bitcast (i1 ({ i32, i32 }*)* @fn5 to i1 (i32, i32)*)(i32 %3, i32 %5)
ret i1 %6
}