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DAG combine should not increase alignment of loads / stores with alignment less

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than ABI alignment. These are loads / stores from / to "packed" data structures.
Their alignments are intentionally under-specified.

rdar://10301431


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145273 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2011-11-28 20:42:56 +00:00
parent 678cda052c
commit 1c487869f5
3 changed files with 66 additions and 13 deletions
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38
test/CodeGen/ARM/2011-11-28-DAGCombineBug.ll Normal file
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; RUN: llc < %s -mtriple=thumbv7-apple-ios5.0.0 | FileCheck %s
; rdar://10464621
; DAG combine increases loads from packed types. ARM load / store optimizer then
; combined them into a ldm which causes runtime exception.
%struct.InformationBlock = type <{ i32, %struct.FlagBits, %struct.FlagBits }>
%struct.FlagBits = type <{ [4 x i32] }>
@infoBlock = external global %struct.InformationBlock
define hidden void @foo() {
; CHECK: foo:
; CHECK: ldr.w
; CHECK: ldr.w
; CHECK-NOT: ldm
entry:
%tmp13 = load i32* getelementptr inbounds (%struct.InformationBlock* @infoBlock, i32 0, i32 1, i32 0, i32 0), align 1
%tmp15 = load i32* getelementptr inbounds (%struct.InformationBlock* @infoBlock, i32 0, i32 1, i32 0, i32 1), align 1
%tmp17 = load i32* getelementptr inbounds (%struct.InformationBlock* @infoBlock, i32 0, i32 1, i32 0, i32 2), align 1
%tmp19 = load i32* getelementptr inbounds (%struct.InformationBlock* @infoBlock, i32 0, i32 1, i32 0, i32 3), align 1
%tmp = load i32* getelementptr inbounds (%struct.InformationBlock* @infoBlock, i32 0, i32 2, i32 0, i32 0), align 1
%tmp3 = load i32* getelementptr inbounds (%struct.InformationBlock* @infoBlock, i32 0, i32 2, i32 0, i32 1), align 1
%tmp4 = load i32* getelementptr inbounds (%struct.InformationBlock* @infoBlock, i32 0, i32 2, i32 0, i32 2), align 1
%tmp5 = load i32* getelementptr inbounds (%struct.InformationBlock* @infoBlock, i32 0, i32 2, i32 0, i32 3), align 1
%insert21 = insertvalue [4 x i32] undef, i32 %tmp13, 0
%insert23 = insertvalue [4 x i32] %insert21, i32 %tmp15, 1
%insert25 = insertvalue [4 x i32] %insert23, i32 %tmp17, 2
%insert27 = insertvalue [4 x i32] %insert25, i32 %tmp19, 3
%insert = insertvalue [4 x i32] undef, i32 %tmp, 0
%insert7 = insertvalue [4 x i32] %insert, i32 %tmp3, 1
%insert9 = insertvalue [4 x i32] %insert7, i32 %tmp4, 2
%insert11 = insertvalue [4 x i32] %insert9, i32 %tmp5, 3
tail call void @bar([4 x i32] %insert27, [4 x i32] %insert11)
ret void
}
declare void @bar([4 x i32], [4 x i32])