60 lines
2.1 KiB
LLVM
60 lines
2.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=-bmi | FileCheck %s --check-prefix=ALL
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+bmi | FileCheck %s --check-prefix=ALL
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; Clear high bits via shift, set them with xor (not), then mask them off.
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define i32 @shrink_xor_constant1(i32 %x) {
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; ALL-LABEL: shrink_xor_constant1:
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; ALL: # %bb.0:
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; ALL-NEXT: movl %edi, %eax
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; ALL-NEXT: notl %eax
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; ALL-NEXT: shrl $31, %eax
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; ALL-NEXT: retq
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%sh = lshr i32 %x, 31
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%not = xor i32 %sh, -1
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%and = and i32 %not, 1
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ret i32 %and
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}
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define <4 x i32> @shrink_xor_constant1_splat(<4 x i32> %x) {
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; ALL-LABEL: shrink_xor_constant1_splat:
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; ALL: # %bb.0:
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; ALL-NEXT: pcmpeqd %xmm1, %xmm1
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; ALL-NEXT: pxor %xmm1, %xmm0
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; ALL-NEXT: psrld $31, %xmm0
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; ALL-NEXT: retq
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%sh = lshr <4 x i32> %x, <i32 31, i32 31, i32 31, i32 31>
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%not = xor <4 x i32> %sh, <i32 -1, i32 -1, i32 -1, i32 -1>
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%and = and <4 x i32> %not, <i32 1, i32 1, i32 1, i32 1>
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ret <4 x i32> %and
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}
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; Clear low bits via shift, set them with xor (not), then mask them off.
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define i8 @shrink_xor_constant2(i8 %x) {
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; ALL-LABEL: shrink_xor_constant2:
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; ALL: # %bb.0:
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; ALL-NEXT: movl %edi, %eax
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; ALL-NEXT: notb %al
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; ALL-NEXT: shlb $5, %al
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; ALL-NEXT: # kill: def $al killed $al killed $eax
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; ALL-NEXT: retq
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%sh = shl i8 %x, 5
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%not = xor i8 %sh, -1
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%and = and i8 %not, 224 ; 0xE0
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ret i8 %and
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}
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define <16 x i8> @shrink_xor_constant2_splat(<16 x i8> %x) {
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; ALL-LABEL: shrink_xor_constant2_splat:
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; ALL: # %bb.0:
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; ALL-NEXT: movaps {{.*#+}} xmm0 = [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
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; ALL-NEXT: retq
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%sh = shl <16 x i8> %x, <i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5, i8 5>
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%not = xor <16 x i8> %sh, <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>
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%and = and <16 x i8> %not, <i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1>
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ret <16 x i8> %and
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}
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