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a06a2b5f16
Summary: ``` Name: sub(xor(x, y), or(x, y)) -> neg(and(x, y)) %or = or i32 %y, %x %xor = xor i32 %x, %y %sub = sub i32 %xor, %or => %sub1 = and i32 %x, %y %sub = sub i32 0, %sub1 Optimization: sub(xor(x, y), or(x, y)) -> neg(and(x, y)) Done: 1 Optimization is correct! ``` https://rise4fun.com/Alive/8OI Reviewers: lebedev.ri Reviewed By: lebedev.ri Subscribers: llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D67188 llvm-svn: 370945
116 lines
3.3 KiB
LLVM
116 lines
3.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine -S < %s | FileCheck %s
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declare void @use(i32)
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define i32 @sub_to_and(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_to_and(
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; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[SUB:%.*]] = sub i32 0, [[TMP1]]
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; CHECK-NEXT: ret i32 [[SUB]]
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;
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%or = or i32 %x, %y
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%xor = xor i32 %x, %y
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%sub = sub i32 %xor, %or
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ret i32 %sub
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}
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define i32 @sub_to_and_extra_use_sub(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_to_and_extra_use_sub(
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; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[SUB:%.*]] = sub i32 0, [[TMP1]]
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; CHECK-NEXT: call void @use(i32 [[SUB]])
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; CHECK-NEXT: ret i32 [[SUB]]
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;
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%or = or i32 %x, %y
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%xor = xor i32 %x, %y
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%sub = sub i32 %xor, %or
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call void @use(i32 %sub)
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ret i32 %sub
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}
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define i32 @sub_to_and_extra_use_and(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_to_and_extra_use_and(
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: call void @use(i32 [[XOR]])
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; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[X]], [[Y]]
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; CHECK-NEXT: [[SUB:%.*]] = sub i32 0, [[TMP1]]
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; CHECK-NEXT: ret i32 [[SUB]]
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;
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%or = or i32 %x, %y
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%xor = xor i32 %x, %y
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call void @use(i32 %xor)
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%sub = sub i32 %xor, %or
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ret i32 %sub
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}
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define i32 @sub_to_and_extra_use_or(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_to_and_extra_use_or(
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: call void @use(i32 [[OR]])
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; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[X]], [[Y]]
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; CHECK-NEXT: [[SUB:%.*]] = sub i32 0, [[TMP1]]
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; CHECK-NEXT: ret i32 [[SUB]]
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;
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%or = or i32 %x, %y
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call void @use(i32 %or)
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%xor = xor i32 %x, %y
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%sub = sub i32 %xor, %or
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ret i32 %sub
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}
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define i32 @sub_to_and_or_commuted(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_to_and_or_commuted(
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; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[SUB:%.*]] = sub i32 0, [[TMP1]]
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; CHECK-NEXT: ret i32 [[SUB]]
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;
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%or = or i32 %y, %x
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%xor = xor i32 %x, %y
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%sub = sub i32 %xor, %or
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ret i32 %sub
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}
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define i32 @sub_to_and_and_commuted(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_to_and_and_commuted(
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; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[Y:%.*]], [[X:%.*]]
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; CHECK-NEXT: [[SUB:%.*]] = sub i32 0, [[TMP1]]
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; CHECK-NEXT: ret i32 [[SUB]]
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;
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%or = or i32 %x, %y
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%xor = xor i32 %y, %x
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%sub = sub i32 %xor, %or
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ret i32 %sub
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}
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define <2 x i32> @sub_to_and_vec(<2 x i32> %x, <2 x i32> %y) {
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; CHECK-LABEL: @sub_to_and_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = and <2 x i32> [[Y:%.*]], [[X:%.*]]
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; CHECK-NEXT: [[SUB:%.*]] = sub <2 x i32> zeroinitializer, [[TMP1]]
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; CHECK-NEXT: ret <2 x i32> [[SUB]]
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;
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%or = or <2 x i32> %x, %y
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%xor = xor <2 x i32> %y, %x
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%sub = sub <2 x i32> %xor, %or
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ret <2 x i32> %sub
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}
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; Negative tests
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define i32 @sub_to_and_extra_use_and_or(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_to_and_extra_use_and_or(
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: call void @use(i32 [[OR]])
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; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[X]], [[Y]]
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; CHECK-NEXT: call void @use(i32 [[XOR]])
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; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[XOR]], [[OR]]
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; CHECK-NEXT: ret i32 [[SUB]]
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;
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%or = or i32 %x, %y
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call void @use(i32 %or)
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%xor = xor i32 %x, %y
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call void @use(i32 %xor)
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%sub = sub i32 %xor, %or
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ret i32 %sub
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}
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