llvm-6502/2011-10-27-tstore.ll at 501852423d34578bc41a745681783b04124dd0db - llvm-6502 - Applefritter: Git

6502/llvm-6502

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Nadav Rotem b00418af67 Add a new DAGCombine optimization for BUILD_VECTOR.

If all of the inputs are zero/any_extended, create a new simple BV
which can be further optimized by other BV optimizations.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143297 91177308-0d34-0410-b5e6-96231b3b80d8

2011-10-29 21:23:04 +00:00

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 ; RUN: llc < %s -march=x86-64 -mcpu=corei7 | FileCheck %s
 target triple = "x86_64-unknown-linux-gnu"
 ;CHECK: ltstore
 ;CHECK: pshufd
 ;CHECK: pshufd
 ;CHECK: ret
 define void @ltstore() {
 entry:
   %in = load <4 x i32>* undef
   %j = shufflevector <4 x i32> %in, <4 x i32> undef, <2 x i32> <i32 0, i32 1>
   store <2 x i32> %j, <2 x i32>* undef
   ret void
 }