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Revert r152907.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152935 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2012-03-16 18:20:54 +00:00
parent a82d526b31
commit 0ccae0b1f6
2 changed files with 3 additions and 27 deletions
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18
lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
View File

@ -379,22 +379,10 @@ Instruction *InstCombiner::visitStoreInst(StoreInst &SI) {
unsigned EffectiveStoreAlign = StoreAlign != 0 ? StoreAlign :
TD->getABITypeAlignment(Val->getType());
if (KnownAlign > EffectiveStoreAlign) {
if (KnownAlign > EffectiveStoreAlign)
SI.setAlignment(KnownAlign);
} else if (StoreAlign == 0) {
unsigned PtrAlign = 0;
if (GlobalValue *GV = dyn_cast<GlobalValue>(Ptr->stripPointerCasts()))
PtrAlign = GV->getAlignment();
if (PtrAlign != 0 && PtrAlign < EffectiveStoreAlign)
// The pointer alignment may be less than the effective store
// alignment. If so, then we don't want to increase the alignment here,
// since that could lead to code-gen using instructions which require a
// higher alignment than the pointer guarantees.
SI.setAlignment(PtrAlign);
else
SI.setAlignment(EffectiveStoreAlign);
}
else if (StoreAlign == 0)
SI.setAlignment(EffectiveStoreAlign);
}
// Don't hack volatile/atomic stores.

12
test/Transforms/InstCombine/2012-03-16-StoreAlignment.ll
View File

@ -1,12 +0,0 @@
; RUN: opt < %s -S -instcombine | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
%0 = type { i32, i8, i8, i8 }
@G = external hidden global %0, align 4
define void @f1(i64 %a1) nounwind ssp align 2 {
; CHECK: store i64 %a1, i64* bitcast (%0* @G to i64*), align 4
store i64 %a1, i64* bitcast (%0* @G to i64*)
ret void
}