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R600: Fix an infinite loop when trying to reorganize export/tex vector input 

llvm-svn: 196923
This commit is contained in:
Vincent Lejeune 2013-12-10 14:43:31 +00:00
parent f92d64d160
commit cc0ea74c7b
2 changed files with 67 additions and 5 deletions
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13
llvm/lib/Target/R600/R600ISelLowering.cpp
View File

@ -1442,17 +1442,20 @@ static SDValue ReorganizeVector(SelectionDAG &DAG, SDValue VectorEntry,
VectorEntry.getOperand(3)
};
bool isUnmovable[4] = { false, false, false, false };
for (unsigned i = 0; i < 4; i++)
for (unsigned i = 0; i < 4; i++) {
RemapSwizzle[i] = i;
if (NewBldVec[i].getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
unsigned Idx = dyn_cast<ConstantSDNode>(NewBldVec[i].getOperand(1))
->getZExtValue();
if (i == Idx)
isUnmovable[Idx] = true;
}
}
for (unsigned i = 0; i < 4; i++) {
if (NewBldVec[i].getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
unsigned Idx = dyn_cast<ConstantSDNode>(NewBldVec[i].getOperand(1))
->getZExtValue();
if (i == Idx) {
isUnmovable[Idx] = true;
continue;
}
if (isUnmovable[Idx])
continue;
// Swap i and Idx

59
llvm/test/CodeGen/R600/r600-infinite-loop-bug-while-reorganizing-vector.ll Normal file
View File

@ -0,0 +1,59 @@
;RUN: llc < %s -march=r600 -mcpu=cayman
;REQUIRES: asserts
define void @main(<4 x float> inreg, <4 x float> inreg) #0 {
main_body:
%2 = extractelement <4 x float> %0, i32 0
%3 = extractelement <4 x float> %0, i32 1
%4 = extractelement <4 x float> %0, i32 2
%5 = extractelement <4 x float> %0, i32 3
%6 = insertelement <4 x float> undef, float %2, i32 0
%7 = insertelement <4 x float> %6, float %3, i32 1
%8 = insertelement <4 x float> %7, float %4, i32 2
%9 = insertelement <4 x float> %8, float %5, i32 3
%10 = call <4 x float> @llvm.AMDGPU.cube(<4 x float> %9)
%11 = extractelement <4 x float> %10, i32 0
%12 = extractelement <4 x float> %10, i32 1
%13 = extractelement <4 x float> %10, i32 2
%14 = extractelement <4 x float> %10, i32 3
%15 = call float @fabs(float %13)
%16 = fdiv float 1.000000e+00, %15
%17 = fmul float %11, %16
%18 = fadd float %17, 1.500000e+00
%19 = fmul float %12, %16
%20 = fadd float %19, 1.500000e+00
%21 = insertelement <4 x float> undef, float %20, i32 0
%22 = insertelement <4 x float> %21, float %18, i32 1
%23 = insertelement <4 x float> %22, float %14, i32 2
%24 = insertelement <4 x float> %23, float %5, i32 3
%25 = extractelement <4 x float> %24, i32 0
%26 = extractelement <4 x float> %24, i32 1
%27 = extractelement <4 x float> %24, i32 2
%28 = extractelement <4 x float> %24, i32 3
%29 = insertelement <4 x float> undef, float %25, i32 0
%30 = insertelement <4 x float> %29, float %26, i32 1
%31 = insertelement <4 x float> %30, float %27, i32 2
%32 = insertelement <4 x float> %31, float %28, i32 3
%33 = call <4 x float> @llvm.AMDGPU.tex(<4 x float> %32, i32 16, i32 0, i32 13)
%34 = extractelement <4 x float> %33, i32 0
%35 = insertelement <4 x float> undef, float %34, i32 0
%36 = insertelement <4 x float> %35, float %34, i32 1
%37 = insertelement <4 x float> %36, float %34, i32 2
%38 = insertelement <4 x float> %37, float 1.000000e+00, i32 3
call void @llvm.R600.store.swizzle(<4 x float> %38, i32 0, i32 0)
ret void
}
; Function Attrs: readnone
declare <4 x float> @llvm.AMDGPU.cube(<4 x float>) #1
; Function Attrs: readnone
declare float @fabs(float) #1
; Function Attrs: readnone
declare <4 x float> @llvm.AMDGPU.tex(<4 x float>, i32, i32, i32) #1
declare void @llvm.R600.store.swizzle(<4 x float>, i32, i32)
attributes #0 = { "ShaderType"="0" }
attributes #1 = { readnone }