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If the alignment of the byval argument is greater than the alignment

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of the frame then increase the maximum alignment of the frame to
match.

Fixes PR6965

llvm-svn: 132764
This commit is contained in:
Eric Christopher 2011-06-09 00:15:19 +00:00
parent 1ae9ec6124
commit 65f7ea8a35
2 changed files with 61 additions and 0 deletions
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2
lib/CodeGen/CallingConvLower.cpp
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@ -49,6 +49,8 @@ void CCState::HandleByVal(unsigned ValNo, MVT ValVT,
Size = MinSize;
if (MinAlign > (int)Align)
Align = MinAlign;
if (MF.getFrameInfo()->getMaxAlignment() < Align)
MF.getFrameInfo()->setMaxAlignment(Align);
TM.getTargetLowering()->HandleByVal(const_cast<CCState*>(this), Size);
unsigned Offset = AllocateStack(Size, Align);
addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));

59
test/CodeGen/X86/byval-align.ll Normal file
View File

@ -0,0 +1,59 @@
; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s
%struct.S = type { i32}
@.str = private constant [10 x i8] c"ptr = %p\0A\00", align 1 ; <[10 x i8]*> [#uses=1]
@.str1 = private constant [8 x i8] c"Failed \00", align 1 ; <[8 x i8]*> [#uses=1]
@.str2 = private constant [2 x i8] c"0\00", align 1 ; <[2 x i8]*> [#uses=1]
@.str3 = private constant [7 x i8] c"test.c\00", align 1 ; <[7 x i8]*> [#uses=1]
@__PRETTY_FUNCTION__.2067 = internal constant [13 x i8] c"aligned_func\00" ; <[13 x i8]*> [#uses=1]
define void @aligned_func(%struct.S* byval align 64 %obj) nounwind {
entry:
%ptr = alloca i8* ; <i8**> [#uses=3]
%p = alloca i64 ; <i64*> [#uses=3]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%obj1 = bitcast %struct.S* %obj to i8* ; <i8*> [#uses=1]
store i8* %obj1, i8** %ptr, align 8
%0 = load i8** %ptr, align 8 ; <i8*> [#uses=1]
%1 = ptrtoint i8* %0 to i64 ; <i64> [#uses=1]
store i64 %1, i64* %p, align 8
%2 = load i8** %ptr, align 8 ; <i8*> [#uses=1]
%3 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([10 x i8]* @.str, i64 0, i64 0), i8* %2) nounwind ; <i32> [#uses=0]
%4 = load i64* %p, align 8 ; <i64> [#uses=1]
%5 = and i64 %4, 140737488355264 ; <i64> [#uses=1]
%6 = load i64* %p, align 8 ; <i64> [#uses=1]
%7 = icmp ne i64 %5, %6 ; <i1> [#uses=1]
br i1 %7, label %bb, label %bb2
bb: ; preds = %entry
%8 = call i32 @puts(i8* getelementptr inbounds ([8 x i8]* @.str1, i64 0, i64 0)) nounwind ; <i32> [#uses=0]
call void @__assert_fail(i8* getelementptr inbounds ([2 x i8]* @.str2, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8]* @.str3, i64 0, i64 0), i32 18, i8* getelementptr inbounds ([13 x i8]* @__PRETTY_FUNCTION__.2067, i64 0, i64 0)) noreturn nounwind
unreachable
bb2: ; preds = %entry
br label %return
return: ; preds = %bb2
ret void
}
declare i32 @printf(i8*, ...) nounwind
declare i32 @puts(i8*)
declare void @__assert_fail(i8*, i8*, i32, i8*) noreturn nounwind
define void @main() nounwind {
entry:
; CHECK: main
; CHECK: andq $-64, %rsp
%s1 = alloca %struct.S ; <%struct.S*> [#uses=4]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%0 = getelementptr inbounds %struct.S* %s1, i32 0, i32 0 ; <i32*> [#uses=1]
store i32 1, i32* %0, align 4
call void @aligned_func(%struct.S* byval align 64 %s1) nounwind
br label %return
return: ; preds = %entry
ret void
}