159 lines
4.7 KiB
LLVM
159 lines
4.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S < %s -instcombine | FileCheck %s
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; Fold
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; (X & (- Y)) - X
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; to
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; - (X & (Y - 1))
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;
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; This allows us to possibly hoist said negation further out.
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; https://bugs.llvm.org/show_bug.cgi?id=44448
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; Base tests
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define i8 @t0(i8 %x, i8 %y) {
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; CHECK-LABEL: @t0(
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; CHECK-NEXT: [[TMP1:%.*]] = add i8 [[Y:%.*]], -1
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; CHECK-NEXT: [[TMP2:%.*]] = and i8 [[TMP1]], [[X:%.*]]
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; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 0, [[TMP2]]
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; CHECK-NEXT: ret i8 [[NEGBIAS]]
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;
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%negy = sub i8 0, %y
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%unbiasedx = and i8 %negy, %x
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%negbias = sub i8 %unbiasedx, %x
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ret i8 %negbias
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}
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declare i8 @gen8()
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define i8 @t1_commutative(i8 %y) {
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; CHECK-LABEL: @t1_commutative(
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; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[TMP1:%.*]] = add i8 [[Y:%.*]], -1
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; CHECK-NEXT: [[TMP2:%.*]] = and i8 [[X]], [[TMP1]]
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; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 0, [[TMP2]]
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; CHECK-NEXT: ret i8 [[NEGBIAS]]
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;
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%x = call i8 @gen8()
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%negy = sub i8 0, %y
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%unbiasedx = and i8 %x, %negy ; commutative, swapped
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%negbias = sub i8 %unbiasedx, %x
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ret i8 %negbias
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}
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define <2 x i8> @t2_vec(<2 x i8> %x, <2 x i8> %y) {
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; CHECK-LABEL: @t2_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = add <2 x i8> [[Y:%.*]], <i8 -1, i8 -1>
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; CHECK-NEXT: [[TMP2:%.*]] = and <2 x i8> [[TMP1]], [[X:%.*]]
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; CHECK-NEXT: [[NEGBIAS:%.*]] = sub <2 x i8> zeroinitializer, [[TMP2]]
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; CHECK-NEXT: ret <2 x i8> [[NEGBIAS]]
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;
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%negy = sub <2 x i8> <i8 0, i8 0>, %y
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%unbiasedx = and <2 x i8> %negy, %x
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%negbias = sub <2 x i8> %unbiasedx, %x
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ret <2 x i8> %negbias
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}
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define <2 x i8> @t3_vec_undef(<2 x i8> %x, <2 x i8> %y) {
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; CHECK-LABEL: @t3_vec_undef(
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; CHECK-NEXT: [[TMP1:%.*]] = add <2 x i8> [[Y:%.*]], <i8 -1, i8 -1>
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; CHECK-NEXT: [[TMP2:%.*]] = and <2 x i8> [[TMP1]], [[X:%.*]]
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; CHECK-NEXT: [[NEGBIAS:%.*]] = sub <2 x i8> zeroinitializer, [[TMP2]]
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; CHECK-NEXT: ret <2 x i8> [[NEGBIAS]]
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;
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%negy = sub <2 x i8> <i8 0, i8 undef>, %y
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%unbiasedx = and <2 x i8> %negy, %x
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%negbias = sub <2 x i8> %unbiasedx, %x
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ret <2 x i8> %negbias
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}
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; Extra uses always prevent fold
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declare void @use8(i8)
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define i8 @n4_extrause0(i8 %x, i8 %y) {
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; CHECK-LABEL: @n4_extrause0(
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; CHECK-NEXT: [[NEGY:%.*]] = sub i8 0, [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[NEGY]])
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; CHECK-NEXT: [[UNBIASEDX:%.*]] = and i8 [[NEGY]], [[X:%.*]]
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; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 [[UNBIASEDX]], [[X]]
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; CHECK-NEXT: ret i8 [[NEGBIAS]]
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;
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%negy = sub i8 0, %y
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call void @use8(i8 %negy)
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%unbiasedx = and i8 %negy, %x
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%negbias = sub i8 %unbiasedx, %x
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ret i8 %negbias
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}
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define i8 @n5_extrause1(i8 %x, i8 %y) {
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; CHECK-LABEL: @n5_extrause1(
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; CHECK-NEXT: [[NEGY:%.*]] = sub i8 0, [[Y:%.*]]
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; CHECK-NEXT: [[UNBIASEDX:%.*]] = and i8 [[NEGY]], [[X:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[UNBIASEDX]])
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; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 [[UNBIASEDX]], [[X]]
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; CHECK-NEXT: ret i8 [[NEGBIAS]]
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;
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%negy = sub i8 0, %y
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%unbiasedx = and i8 %negy, %x
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call void @use8(i8 %unbiasedx)
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%negbias = sub i8 %unbiasedx, %x
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ret i8 %negbias
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}
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define i8 @n6_extrause2(i8 %x, i8 %y) {
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; CHECK-LABEL: @n6_extrause2(
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; CHECK-NEXT: [[NEGY:%.*]] = sub i8 0, [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[NEGY]])
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; CHECK-NEXT: [[UNBIASEDX:%.*]] = and i8 [[NEGY]], [[X:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[UNBIASEDX]])
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; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 [[UNBIASEDX]], [[X]]
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; CHECK-NEXT: ret i8 [[NEGBIAS]]
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;
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%negy = sub i8 0, %y
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call void @use8(i8 %negy)
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%unbiasedx = and i8 %negy, %x
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call void @use8(i8 %unbiasedx)
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%negbias = sub i8 %unbiasedx, %x
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ret i8 %negbias
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}
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; Negative tests
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define i8 @n7(i8 %x, i8 %y) {
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; CHECK-LABEL: @n7(
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; CHECK-NEXT: [[NEGY_NOT:%.*]] = add i8 [[Y:%.*]], -1
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; CHECK-NEXT: [[NEGBIAS:%.*]] = and i8 [[NEGY_NOT]], [[X:%.*]]
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; CHECK-NEXT: ret i8 [[NEGBIAS]]
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;
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%negy = sub i8 0, %y
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%unbiasedx = and i8 %negy, %x
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%negbias = sub i8 %x, %unbiasedx ; wrong order
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ret i8 %negbias
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}
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define i8 @n8(i8 %x, i8 %y) {
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; CHECK-LABEL: @n8(
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; CHECK-NEXT: [[NEGY:%.*]] = sub i8 1, [[Y:%.*]]
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; CHECK-NEXT: [[UNBIASEDX:%.*]] = and i8 [[NEGY]], [[X:%.*]]
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; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 [[UNBIASEDX]], [[X]]
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; CHECK-NEXT: ret i8 [[NEGBIAS]]
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;
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%negy = sub i8 1, %y ; not negation
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%unbiasedx = and i8 %negy, %x
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%negbias = sub i8 %unbiasedx, %x
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ret i8 %negbias
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}
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define i8 @n9(i8 %x0, i8 %x1, i8 %y) {
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; CHECK-LABEL: @n9(
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; CHECK-NEXT: [[NEGY:%.*]] = sub i8 0, [[Y:%.*]]
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; CHECK-NEXT: [[UNBIASEDX:%.*]] = and i8 [[NEGY]], [[X1:%.*]]
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; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 [[UNBIASEDX]], [[X0:%.*]]
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; CHECK-NEXT: ret i8 [[NEGBIAS]]
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;
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%negy = sub i8 0, %y
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%unbiasedx = and i8 %x1, %negy ; not %x0
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%negbias = sub i8 %unbiasedx, %x0 ; not %x1
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ret i8 %negbias
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}
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