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When widening a vector load, use the correct chain. This fixes PR4891.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81343 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-09-09 14:22:57 +00:00
parent 43b1b0e4ff
commit 607a0508ba
3 changed files with 67 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
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@ -1678,7 +1678,7 @@ SDValue DAGTypeLegalizer::WidenVecRes_LOAD(SDNode *N) {
// Modified the chain - switch anything that used the old chain to use
// the new one.
ReplaceValueWith(SDValue(N, 1), Chain);
ReplaceValueWith(SDValue(N, 1), NewChain);
return Result;
}

21
test/CodeGen/X86/widen_load-0.ll Normal file
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@ -0,0 +1,21 @@
; RUN: llc < %s -o - -march=x86-64 | FileCheck %s
; PR4891
; Both loads should happen before either store.
; CHECK: movl (%rdi), %eax
; CHECK: movl (%rsi), %ecx
; CHECK: movl %ecx, (%rdi)
; CHECK: movl %eax, (%rsi)
define void @short2_int_swap(<2 x i16>* nocapture %b, i32* nocapture %c) nounwind {
entry:
%0 = load <2 x i16>* %b, align 2 ; <<2 x i16>> [#uses=1]
%1 = load i32* %c, align 4 ; <i32> [#uses=1]
%tmp1 = bitcast i32 %1 to <2 x i16> ; <<2 x i16>> [#uses=1]
store <2 x i16> %tmp1, <2 x i16>* %b, align 2
%tmp5 = bitcast <2 x i16> %0 to <1 x i32> ; <<1 x i32>> [#uses=1]
%tmp3 = extractelement <1 x i32> %tmp5, i32 0 ; <i32> [#uses=1]
store i32 %tmp3, i32* %c, align 4
ret void
}

45
test/CodeGen/X86/widen_load-1.ll Normal file
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@ -0,0 +1,45 @@
; RUN: llc %s -o - -march=x86-64 -mtriple=x86_64-unknown-linux-gnu -disable-mmx | FileCheck %s
; PR4891
; This load should be before the call, not after.
; CHECK: movq compl+128(%rip), %xmm0
; CHECK: movaps %xmm0, (%rsp)
; CHECK: call killcommon
@compl = linkonce global [20 x i64] zeroinitializer, align 64 ; <[20 x i64]*> [#uses=1]
declare void @killcommon(i32* noalias)
define void @reset(<2 x float>* noalias %garbage1) {
"file complex.c, line 27, bb1":
%changed = alloca i32, align 4 ; <i32*> [#uses=3]
br label %"file complex.c, line 27, bb13"
"file complex.c, line 27, bb13": ; preds = %"file complex.c, line 27, bb1"
store i32 0, i32* %changed, align 4
%r2 = getelementptr float* bitcast ([20 x i64]* @compl to float*), i64 32 ; <float*> [#uses=1]
%r3 = bitcast float* %r2 to <2 x float>* ; <<2 x float>*> [#uses=1]
%r4 = load <2 x float>* %r3, align 4 ; <<2 x float>> [#uses=1]
call void @killcommon(i32* %changed)
br label %"file complex.c, line 34, bb4"
"file complex.c, line 34, bb4": ; preds = %"file complex.c, line 27, bb13"
%r5 = load i32* %changed, align 4 ; <i32> [#uses=1]
%r6 = icmp eq i32 %r5, 0 ; <i1> [#uses=1]
%r7 = zext i1 %r6 to i32 ; <i32> [#uses=1]
%r8 = icmp ne i32 %r7, 0 ; <i1> [#uses=1]
br i1 %r8, label %"file complex.c, line 34, bb7", label %"file complex.c, line 27, bb5"
"file complex.c, line 27, bb5": ; preds = %"file complex.c, line 34, bb4"
br label %"file complex.c, line 35, bb6"
"file complex.c, line 35, bb6": ; preds = %"file complex.c, line 27, bb5"
%r11 = ptrtoint <2 x float>* %garbage1 to i64 ; <i64> [#uses=1]
%r12 = inttoptr i64 %r11 to <2 x float>* ; <<2 x float>*> [#uses=1]
store <2 x float> %r4, <2 x float>* %r12, align 4
br label %"file complex.c, line 34, bb7"
"file complex.c, line 34, bb7": ; preds = %"file complex.c, line 35, bb6", %"file complex.c, line 34, bb4"
ret void
}