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Handle splats of undefs properly. This includes the testcase for PR5364 as well.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85767 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2009-11-02 00:12:06 +00:00
parent 3a639a07ea
commit 2ae0eec1c0
2 changed files with 23 additions and 0 deletions
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3
lib/Target/ARM/ARMISelLowering.cpp
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@ -2735,6 +2735,9 @@ static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
if (ShuffleVectorSDNode::isSplatMask(&ShuffleMask[0], VT)) {
int Lane = SVN->getSplatIndex();
// If this is undef splat, generate it via "just" vdup, if possible.
if (Lane == -1) Lane = 0;
if (Lane == 0 && V1.getOpcode() == ISD::SCALAR_TO_VECTOR) {
return DAG.getNode(ARMISD::VDUP, dl, VT, V1.getOperand(0));
}

20
test/CodeGen/ARM/2009-11-02-NegativeLane.ll Normal file
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@ -0,0 +1,20 @@
; RUN: llc -mcpu=cortex-a8 < %s | grep vdup.32
target datalayout = "e-p:32:32:32-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"
target triple = "armv7-eabi"
define arm_aapcs_vfpcc void @foo(i8* nocapture %pBuffer, i32 %numItems) nounwind {
entry:
br i1 undef, label %return, label %bb
bb: ; preds = %bb, %entry
%0 = load float* undef, align 4 ; <float> [#uses=1]
%1 = insertelement <4 x float> undef, float %0, i32 2 ; <<4 x float>> [#uses=1]
%2 = insertelement <4 x float> %1, float undef, i32 3 ; <<4 x float>> [#uses=1]
%3 = fmul <4 x float> undef, %2 ; <<4 x float>> [#uses=1]
%4 = extractelement <4 x float> %3, i32 1 ; <float> [#uses=1]
store float %4, float* undef, align 4
br i1 undef, label %return, label %bb
return: ; preds = %bb, %entry
ret void
}