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bf8ef9fdc3
This is a repeat of 1880092722 from 2009. We should have less risk of hitting bugs at this point because we auto-generate positive CHECK lines only, but this makes things consistent. Copying the original commit msg: "Change tests from "opt %s" to "opt < %s" so that opt doesn't see the input filename so that opt doesn't print the input filename in the output so that grep lines in the tests don't unintentionally match strings in the input filename."
118 lines
3.6 KiB
LLVM
118 lines
3.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -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:%.*]] = sdiv 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 = sdiv 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:%.*]] = sdiv <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 = sdiv <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:%.*]] = sdiv 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 = sdiv 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:%.*]] = sdiv 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 = sdiv 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:%.*]] = sdiv 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 = sdiv 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:%.*]] = sdiv 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 = sdiv 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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