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llvm-6502/test/CodeGen/X86/extract-concat.ll
Michael Liao 07edaf3801 Revert part of r166049 back and enable test case in r166125.
- Folding (trunc (concat ... X )) to (concat ... (trunc X) ...) is valid
  when '...' are all 'undef's.
- r166125 relies on this transformation.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166155 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-17 23:45:54 +00:00

18 lines
648 B
LLVM

; RUN: llc < %s -mcpu=corei7 -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
define void @foo(<4 x float> %in, <4 x i8>* %out) {
%t0 = fptosi <4 x float> %in to <4 x i32>
%t1 = trunc <4 x i32> %t0 to <4 x i16>
%t2 = shufflevector <4 x i16> %t1, <4 x i16> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
%t3 = trunc <8 x i16> %t2 to <8 x i8>
%t4 = shufflevector <8 x i8> %t3, <8 x i8> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
%t5 = insertelement <4 x i8> %t4, i8 -1, i32 3
store <4 x i8> %t5, <4 x i8>* %out
ret void
; CHECK: foo
; CHECK: cvttps2dq
; CHECK-NOT: pextrd
; CHECK: pshufb
; CHECK: ret
}