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ValueTracker can't assume that an alloca with no specified alignment

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will get its preferred alignment.  It has to be careful and cautiously assume
it will just get the ABI alignment.  This prevents instcombine from rounding
up the alignment of a load/store without adjusting the alignment of the alloca.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61934 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-01-08 19:28:38 +00:00
parent 1e407c338f
commit 0f2831c820
2 changed files with 27 additions and 1 deletions
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2
lib/Analysis/ValueTracking.cpp
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@ -416,7 +416,7 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
unsigned Align = AI->getAlignment(); unsigned Align = AI->getAlignment();
if (Align == 0 && TD) { if (Align == 0 && TD) {
if (isa<AllocaInst>(AI)) if (isa<AllocaInst>(AI))
Align = TD->getPrefTypeAlignment(AI->getType()->getElementType()); Align = TD->getABITypeAlignment(AI->getType()->getElementType());
else if (isa<MallocInst>(AI)) { else if (isa<MallocInst>(AI)) {
// Malloc returns maximally aligned memory. // Malloc returns maximally aligned memory.
Align = TD->getABITypeAlignment(AI->getType()->getElementType()); Align = TD->getABITypeAlignment(AI->getType()->getElementType());

26
test/Transforms/InstCombine/2009-01-08-AlignAlloca.ll Normal file
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@ -0,0 +1,26 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {, align 4} | count 4
; rdar://6480438
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin9.6"
%struct.Key = type { { i32, i32 } }
%struct.anon = type <{ i8, [3 x i8], i32 }>
define i32 @bar(i64 %key_token2) nounwind {
entry:
%iospec = alloca %struct.Key ; <%struct.Key*> [#uses=3]
%ret = alloca i32 ; <i32*> [#uses=2]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%0 = getelementptr %struct.Key* %iospec, i32 0, i32 0 ; <{ i32, i32 }*> [#uses=2]
%1 = getelementptr { i32, i32 }* %0, i32 0, i32 0 ; <i32*> [#uses=1]
store i32 0, i32* %1, align 4
%2 = getelementptr { i32, i32 }* %0, i32 0, i32 1 ; <i32*> [#uses=1]
store i32 0, i32* %2, align 4
%3 = getelementptr %struct.Key* %iospec, i32 0, i32 0 ; <{ i32, i32 }*> [#uses=1]
%4 = bitcast { i32, i32 }* %3 to i64* ; <i64*> [#uses=1]
store i64 %key_token2, i64* %4, align 4
%5 = call i32 (...)* @foo(%struct.Key* byval align 4 %iospec, i32* %ret) nounwind ; <i32> [#uses=0]
%6 = load i32* %ret, align 4 ; <i32> [#uses=1]
ret i32 %6
}
declare i32 @foo(...)