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