llvm-6502/test/CodeGen/X86/SwizzleShuff.ll

; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7-avx -mattr=+avx | FileCheck %s

; Check that we perform a scalar XOR on i32.

; CHECK: pull_bitcast
; CHECK: xorl
; CHECK: ret
define void @pull_bitcast (<4 x i8>* %pA, <4 x i8>* %pB) {
  %A = load <4 x i8>* %pA
  %B = load <4 x i8>* %pB
  %C = xor <4 x i8> %A, %B
  store <4 x i8> %C, <4 x i8>* %pA
  ret void
}
This commit contains a few changes that had to go in together. 1. Simplify xor/and/or (bitcast(A), bitcast(B)) -> bitcast(op (A,B)) (and also scalar_to_vector). 2. Xor/and/or are indifferent to the swizzle operation (shuffle of one src). Simplify xor/and/or (shuff(A), shuff(B)) -> shuff(op (A, B)) 3. Optimize swizzles of shuffles: shuff(shuff(x, y), undef) -> shuff(x, y). 4. Fix an X86ISelLowering optimization which was very bitcast-sensitive. Code which was previously compiled to this: movd (%rsi), %xmm0 movdqa .LCPI0_0(%rip), %xmm2 pshufb %xmm2, %xmm0 movd (%rdi), %xmm1 pshufb %xmm2, %xmm1 pxor %xmm0, %xmm1 pshufb .LCPI0_1(%rip), %xmm1 movd %xmm1, (%rdi) ret Now compiles to this: movl (%rsi), %eax xorl %eax, (%rdi) ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153848 91177308-0d34-0410-b5e6-96231b3b80d8 2012-04-01 19:31:22 +00:00			`; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7-avx -mattr=+avx \| FileCheck %s`

			`; Check that we perform a scalar XOR on i32.`

			`; CHECK: pull_bitcast`
			`; CHECK: xorl`
			`; CHECK: ret`
			`define void @pull_bitcast (<4 x i8>* %pA, <4 x i8>* %pB) {`
			`%A = load <4 x i8>* %pA`
			`%B = load <4 x i8>* %pB`
			`%C = xor <4 x i8> %A, %B`
			`store <4 x i8> %C, <4 x i8>* %pA`
			`ret void`
			`}`