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[PowerPC] Enable splat generation for BUILD_VECTOR with little endian
When enabling PPC64LE, I disabled some optimizations of BUILD_VECTOR nodes for little endian because wrong results were produced. I've subsequently investigated and found this is due to a call to BuildVectorSDNode::isConstantSplat that was always specifying big-endian. With this changed to correctly identify the target endianness, the optimizations work as expected. I found another case of a call to the same method with big-endian hardcoded, in PPC::isAllNegativeZeroVector(). I discovered this was an orphaned method with no callers, so I've just removed it. The existing test/CodeGen/PowerPC/vec_constants.ll checks these optimizations, so for testing I've just added a variant for little endian. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234011 91177308-0d34-0410-b5e6-96231b3b80d8
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@@ -1,7 +1,5 @@
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; RUN: llc -O0 -mcpu=pwr7 < %s | FileCheck %s
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target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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; RUN: llc -O0 -mcpu=pwr7 -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s
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; RUN: llc -O0 -mcpu=pwr7 -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
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define void @test1(<4 x i32>* %P1, <4 x i32>* %P2, <4 x float>* %P3) nounwind {
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%tmp = load <4 x i32>, <4 x i32>* %P1 ; <<4 x i32>> [#uses=1]
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