[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
This commit is contained in:
Bill Schmidt
2015-04-03 13:48:24 +00:00
parent e5ecd32488
commit 1c4b6de5ed
3 changed files with 4 additions and 41 deletions

View File

@@ -1,7 +1,5 @@
; RUN: llc -O0 -mcpu=pwr7 < %s | FileCheck %s
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"
target triple = "powerpc64-unknown-linux-gnu"
; RUN: llc -O0 -mcpu=pwr7 -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s
; RUN: llc -O0 -mcpu=pwr7 -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
define void @test1(<4 x i32>* %P1, <4 x i32>* %P2, <4 x float>* %P3) nounwind {
%tmp = load <4 x i32>, <4 x i32>* %P1 ; <<4 x i32>> [#uses=1]