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6d5f31ab18
Summary: Nodes that have no uses are eventually pruned when they are selected from the worklist. Record nodes newly added to the worklist or DAG and perform pruning after every combine attempt. Reviewers: efriedma, RKSimon, craig.topper, spatel, jyknight Reviewed By: jyknight Subscribers: jdoerfert, jyknight, nemanjai, jvesely, nhaehnle, javed.absar, hiraditya, jsji, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D58070 llvm-svn: 357283
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 --check-prefix=NO_BMI
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+bmi | FileCheck %s --check-prefix=ALL --check-prefix=BMI
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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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