2nd attempt, fixing SSE4.1 issues and implementing feedback from duncan.

PR2957

ISD::VECTOR_SHUFFLE now stores an array of integers representing the shuffle
mask internal to the node, rather than taking a BUILD_VECTOR of ConstantSDNodes
as the shuffle mask.  A value of -1 represents UNDEF.

In addition to eliminating the creation of illegal BUILD_VECTORS just to 
represent shuffle masks, we are better about canonicalizing the shuffle mask,
resulting in substantially better code for some classes of shuffles.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70225 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 4 deletions

diff --git a/test/CodeGen/X86/vec_shuffle-30.ll b/test/CodeGen/X86/vec_shuffle-30.ll
index 38f02fe238..50a3df8f0b 100644
--- a/test/CodeGen/X86/vec_shuffle-30.ll
+++ b/test/CodeGen/X86/vec_shuffle-30.ll
@@ -1,8 +1,7 @@
 ; RUN: llvm-as < %s | llc -march=x86 -mattr=sse41 -disable-mmx -o %t -f
 ; RUN: grep pshufhw %t | grep 161 | count 1
-; RUN: grep pslldq %t | count 1
-
-
+; RUN: grep shufps %t | count 1
+; RUN: not grep pslldq %t
 
 ; Test case when creating pshufhw, we incorrectly set the higher order bit
 ; for an undef,
@@ -20,4 +19,4 @@ entry:
   %0 = shufflevector <4 x i32> %in, <4 x i32> <i32 0, i32 0, i32 0, i32 0>, <4 x i32> < i32 undef, i32 5, i32 undef, i32 2>
   store <4 x i32> %0, <4 x i32>* %dest
   ret void
-}       
\ No newline at end of file
+}