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getSplatIndex assumes that the first element of the mask contains the splat index

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which is not always true if the mask contains undefs. Modified it to return
the first non undef value.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96621 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Mon P Wang 2010-02-18 22:33:18 +00:00
parent 39a4bb3527
commit 1c40e188c5
2 changed files with 18 additions and 6 deletions
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7
include/llvm/CodeGen/SelectionDAGNodes.h
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@ -1764,7 +1764,12 @@ public:
bool isSplat() const { return isSplatMask(Mask, getValueType(0)); }
int getSplatIndex() const {
assert(isSplat() && "Cannot get splat index for non-splat!");
return Mask[0];
EVT VT = getValueType(0);
for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i) {
if (Mask[i] != -1)
return Mask[i];
}
return -1;
}
static bool isSplatMask(const int *Mask, EVT VT);

17
test/CodeGen/X86/vec_shuffle-36.ll
View File

@ -1,9 +1,16 @@
; RUN: llc < %s -march=x86 -mattr=sse41 -o %t
; RUN: grep pshufb %t | count 1
; RUN: llc < %s -march=x86-64 -mattr=sse41 | FileCheck %s
define <8 x i16> @shuf6(<8 x i16> %T0, <8 x i16> %T1) nounwind readnone {
; CHECK: pshufb
; CHECK-NOT: pshufb
; CHECK: ret
entry:
%tmp9 = shufflevector <8 x i16> %T0, <8 x i16> %T1, <8 x i32> < i32 3, i32 2, i32 0, i32 2, i32 1, i32 5, i32 6 , i32 undef >
ret <8 x i16> %tmp9
%tmp9 = shufflevector <8 x i16> %T0, <8 x i16> %T1, <8 x i32> < i32 3, i32 2, i32 0, i32 2, i32 1, i32 5, i32 6 , i32 undef >
ret <8 x i16> %tmp9
}
define <8 x i16> @shuf7(<8 x i16> %t0) {
; CHECK: pshufd
%tmp10 = shufflevector <8 x i16> %t0, <8 x i16> undef, <8 x i32> < i32 undef, i32 2, i32 2, i32 2, i32 2, i32 2, i32 undef, i32 undef >
ret <8 x i16> %tmp10
}