118 lines
3.7 KiB
LLVM
118 lines
3.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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; Fold
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; x - ((x / y) * y)
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; to
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; x % y
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; Also,
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; ((x / y) * y)
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; can then be simplified to
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; x - (x % y)
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declare void @use8(i8)
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declare void @use2xi8(<2 x i8>)
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define i8 @t0_basic(i8 %x, i8 %y) {
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; CHECK-LABEL: @t0_basic(
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; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[DIV]])
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; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]]
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; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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; CHECK-NEXT: ret i8 [[REM]]
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;
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%div = udiv i8 %x, %y
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call void @use8(i8 %div)
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%roundXdownToMultipleOfY = mul i8 %div, %y
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%rem = sub i8 %x, %roundXdownToMultipleOfY
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ret i8 %rem
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}
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define <2 x i8> @t1_vector(<2 x i8> %x, <2 x i8> %y) {
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; CHECK-LABEL: @t1_vector(
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; CHECK-NEXT: [[DIV:%.*]] = udiv <2 x i8> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: call void @use2xi8(<2 x i8> [[DIV]])
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; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul <2 x i8> [[DIV]], [[Y]]
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; CHECK-NEXT: [[REM:%.*]] = sub <2 x i8> [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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; CHECK-NEXT: ret <2 x i8> [[REM]]
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;
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%div = udiv <2 x i8> %x, %y
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call void @use2xi8(<2 x i8> %div)
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%roundXdownToMultipleOfY = mul <2 x i8> %div, %y
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%rem = sub <2 x i8> %x, %roundXdownToMultipleOfY
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ret <2 x i8> %rem
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}
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; Extra use
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define i8 @t4_extrause(i8 %x, i8 %y) {
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; CHECK-LABEL: @t4_extrause(
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; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[DIV]])
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; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]]
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; CHECK-NEXT: call void @use8(i8 [[ROUNDXDOWNTOMULTIPLEOFY]])
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; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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; CHECK-NEXT: ret i8 [[REM]]
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;
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%div = udiv i8 %x, %y
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call void @use8(i8 %div)
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%roundXdownToMultipleOfY = mul i8 %div, %y
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call void @use8(i8 %roundXdownToMultipleOfY)
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%rem = sub i8 %x, %roundXdownToMultipleOfY
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ret i8 %rem
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}
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; Commutativity
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declare i8 @gen8()
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define i8 @t5_commutative(i8 %x) {
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; CHECK-LABEL: @t5_commutative(
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; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8()
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; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[X:%.*]], [[Y]]
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; CHECK-NEXT: call void @use8(i8 [[DIV]])
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; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[Y]], [[DIV]]
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; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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; CHECK-NEXT: ret i8 [[REM]]
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;
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%y = call i8 @gen8()
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%div = udiv i8 %x, %y
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call void @use8(i8 %div)
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%roundXdownToMultipleOfY = mul i8 %y, %div ; swapped
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%rem = sub i8 %x, %roundXdownToMultipleOfY
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ret i8 %rem
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}
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; Negative tests
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define i8 @n6_different_x(i8 %x0, i8 %x1, i8 %y) {
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; CHECK-LABEL: @n6_different_x(
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; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[X0:%.*]], [[Y:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[DIV]])
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; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y]]
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; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X1:%.*]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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; CHECK-NEXT: ret i8 [[REM]]
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;
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%div = udiv i8 %x0, %y
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call void @use8(i8 %div)
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%roundXdownToMultipleOfY = mul i8 %div, %y
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%rem = sub i8 %x1, %roundXdownToMultipleOfY
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ret i8 %rem
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}
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define i8 @n6_different_y(i8 %x, i8 %y0, i8 %y1) {
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; CHECK-LABEL: @n6_different_y(
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; CHECK-NEXT: [[DIV:%.*]] = udiv i8 [[X:%.*]], [[Y0:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[DIV]])
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; CHECK-NEXT: [[ROUNDXDOWNTOMULTIPLEOFY:%.*]] = mul i8 [[DIV]], [[Y1:%.*]]
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; CHECK-NEXT: [[REM:%.*]] = sub i8 [[X]], [[ROUNDXDOWNTOMULTIPLEOFY]]
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; CHECK-NEXT: ret i8 [[REM]]
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;
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%div = udiv i8 %x, %y0
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call void @use8(i8 %div)
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%roundXdownToMultipleOfY = mul i8 %div, %y1
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%rem = sub i8 %x, %roundXdownToMultipleOfY
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ret i8 %rem
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}
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