llvm-mirror/test/Transforms/InstSimplify/reassociate.ll
2018-01-18 23:11:24 +00:00

267 lines
5.4 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instsimplify -S | FileCheck %s
define i32 @add1(i32 %x) {
; CHECK-LABEL: @add1(
; CHECK-NEXT: ret i32 [[X:%.*]]
;
; (X + -1) + 1 -> X
%l = add i32 %x, -1
%r = add i32 %l, 1
ret i32 %r
}
define i32 @and1(i32 %x, i32 %y) {
; CHECK-LABEL: @and1(
; CHECK-NEXT: [[L:%.*]] = and i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[L]]
;
; (X & Y) & X -> X & Y
%l = and i32 %x, %y
%r = and i32 %l, %x
ret i32 %r
}
define i32 @and2(i32 %x, i32 %y) {
; CHECK-LABEL: @and2(
; CHECK-NEXT: [[R:%.*]] = and i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[R]]
;
; X & (X & Y) -> X & Y
%r = and i32 %x, %y
%l = and i32 %x, %r
ret i32 %l
}
define i32 @or1(i32 %x, i32 %y) {
; CHECK-LABEL: @or1(
; CHECK-NEXT: [[L:%.*]] = or i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[L]]
;
; (X | Y) | X -> X | Y
%l = or i32 %x, %y
%r = or i32 %l, %x
ret i32 %r
}
define i32 @or2(i32 %x, i32 %y) {
; CHECK-LABEL: @or2(
; CHECK-NEXT: [[R:%.*]] = or i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[R]]
;
; X | (X | Y) -> X | Y
%r = or i32 %x, %y
%l = or i32 %x, %r
ret i32 %l
}
define i32 @xor1(i32 %x, i32 %y) {
; CHECK-LABEL: @xor1(
; CHECK-NEXT: ret i32 [[Y:%.*]]
;
; (X ^ Y) ^ X = Y
%l = xor i32 %x, %y
%r = xor i32 %l, %x
ret i32 %r
}
define i32 @xor2(i32 %x, i32 %y) {
; CHECK-LABEL: @xor2(
; CHECK-NEXT: ret i32 [[Y:%.*]]
;
; X ^ (X ^ Y) = Y
%r = xor i32 %x, %y
%l = xor i32 %x, %r
ret i32 %l
}
define i32 @sub1(i32 %x, i32 %y) {
; CHECK-LABEL: @sub1(
; CHECK-NEXT: ret i32 [[Y:%.*]]
;
%d = sub i32 %x, %y
%r = sub i32 %x, %d
ret i32 %r
}
define i32 @sub2(i32 %x) {
; CHECK-LABEL: @sub2(
; CHECK-NEXT: ret i32 -1
;
; X - (X + 1) -> -1
%xp1 = add i32 %x, 1
%r = sub i32 %x, %xp1
ret i32 %r
}
define i32 @sub3(i32 %x, i32 %y) {
; CHECK-LABEL: @sub3(
; CHECK-NEXT: ret i32 [[X:%.*]]
;
; ((X + 1) + Y) - (Y + 1) -> X
%xp1 = add i32 %x, 1
%lhs = add i32 %xp1, %y
%rhs = add i32 %y, 1
%r = sub i32 %lhs, %rhs
ret i32 %r
}
; (no overflow X * Y) / Y -> X
define i32 @mulnsw_sdiv(i32 %x, i32 %y) {
; CHECK-LABEL: @mulnsw_sdiv(
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%mul = mul nsw i32 %x, %y
%r = sdiv i32 %mul, %y
ret i32 %r
}
define <2 x i32> @mulnsw_sdiv_commute(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: @mulnsw_sdiv_commute(
; CHECK-NEXT: ret <2 x i32> [[X:%.*]]
;
%mul = mul nsw <2 x i32> %y, %x
%r = sdiv <2 x i32> %mul, %y
ret <2 x i32> %r
}
; (no overflow X * Y) / Y -> X
define <2 x i8> @mulnuw_udiv(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @mulnuw_udiv(
; CHECK-NEXT: ret <2 x i8> [[X:%.*]]
;
%mul = mul nuw <2 x i8> %x, %y
%r = udiv <2 x i8> %mul, %y
ret <2 x i8> %r
}
define i32 @mulnuw_udiv_commute(i32 %x, i32 %y) {
; CHECK-LABEL: @mulnuw_udiv_commute(
; CHECK-NEXT: ret i32 [[X:%.*]]
;
%mul = mul nuw i32 %y, %x
%r = udiv i32 %mul, %y
ret i32 %r
}
; (((X / Y) * Y) / Y) -> X / Y
define i32 @sdiv_mul_sdiv(i32 %x, i32 %y) {
; CHECK-LABEL: @sdiv_mul_sdiv(
; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[DIV]]
;
%div = sdiv i32 %x, %y
%mul = mul i32 %div, %y
%r = sdiv i32 %mul, %y
ret i32 %r
}
define i32 @sdiv_mul_sdiv_commute(i32 %x, i32 %y) {
; CHECK-LABEL: @sdiv_mul_sdiv_commute(
; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[DIV]]
;
%div = sdiv i32 %x, %y
%mul = mul i32 %y, %div
%r = sdiv i32 %mul, %y
ret i32 %r
}
; (((X / Y) * Y) / Y) -> X / Y
define i32 @udiv_mul_udiv(i32 %x, i32 %y) {
; CHECK-LABEL: @udiv_mul_udiv(
; CHECK-NEXT: [[DIV:%.*]] = udiv i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[DIV]]
;
%div = udiv i32 %x, %y
%mul = mul i32 %div, %y
%r = udiv i32 %mul, %y
ret i32 %r
}
define i32 @udiv_mul_udiv_commute(i32 %x, i32 %y) {
; CHECK-LABEL: @udiv_mul_udiv_commute(
; CHECK-NEXT: [[DIV:%.*]] = udiv i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[DIV]]
;
%div = udiv i32 %x, %y
%mul = mul i32 %y, %div
%r = udiv i32 %mul, %y
ret i32 %r
}
define i32 @sdiv3(i32 %x, i32 %y) {
; CHECK-LABEL: @sdiv3(
; CHECK-NEXT: ret i32 0
;
; (X rem Y) / Y -> 0
%rem = srem i32 %x, %y
%div = sdiv i32 %rem, %y
ret i32 %div
}
define i32 @sdiv4(i32 %x, i32 %y) {
; CHECK-LABEL: @sdiv4(
; CHECK-NEXT: ret i32 [[X:%.*]]
;
; (X / Y) * Y -> X if the division is exact
%div = sdiv exact i32 %x, %y
%mul = mul i32 %div, %y
ret i32 %mul
}
define i32 @sdiv5(i32 %x, i32 %y) {
; CHECK-LABEL: @sdiv5(
; CHECK-NEXT: ret i32 [[X:%.*]]
;
; Y * (X / Y) -> X if the division is exact
%div = sdiv exact i32 %x, %y
%mul = mul i32 %y, %div
ret i32 %mul
}
define i32 @udiv3(i32 %x, i32 %y) {
; CHECK-LABEL: @udiv3(
; CHECK-NEXT: ret i32 0
;
; (X rem Y) / Y -> 0
%rem = urem i32 %x, %y
%div = udiv i32 %rem, %y
ret i32 %div
}
define i32 @udiv4(i32 %x, i32 %y) {
; CHECK-LABEL: @udiv4(
; CHECK-NEXT: ret i32 [[X:%.*]]
;
; (X / Y) * Y -> X if the division is exact
%div = udiv exact i32 %x, %y
%mul = mul i32 %div, %y
ret i32 %mul
}
define i32 @udiv5(i32 %x, i32 %y) {
; CHECK-LABEL: @udiv5(
; CHECK-NEXT: ret i32 [[X:%.*]]
;
; Y * (X / Y) -> X if the division is exact
%div = udiv exact i32 %x, %y
%mul = mul i32 %y, %div
ret i32 %mul
}
define i16 @trunc1(i32 %x) {
; CHECK-LABEL: @trunc1(
; CHECK-NEXT: ret i16 1
;
%y = add i32 %x, 1
%tx = trunc i32 %x to i16
%ty = trunc i32 %y to i16
%d = sub i16 %ty, %tx
ret i16 %d
}