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[InstrSimplify] add testcases for fold sdiv if two operands are negatived and non-overflow

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Differential Revision: https://reviews.llvm.org/D49365

llvm-svn: 337179
This commit is contained in:
Chen Zheng 2018-07-16 15:06:42 +00:00
parent f4c1f99918
commit ff666cdeb3
1 changed files with 49 additions and 0 deletions
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49
test/Transforms/InstCombine/sdiv.ll Normal file
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; RUN: opt < %s -instcombine -S | FileCheck %s
define i32 @negated_operand(i32 %x) {
; CHECK-LABEL: @negated_operand(
; CHECK-NEXT: [[NEGX:%.*]] = sub nsw i32 0, [[X:%.*]]
; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[NEGX]], [[X]]
; CHECK-NEXT: ret i32 [[DIV]]
;
%negx = sub nsw i32 0, %x
%div = sdiv i32 %negx, %x
ret i32 %div
}
define <2 x i32> @negated_operand_commute_vec(<2 x i32> %x) {
; CHECK-LABEL: @negated_operand_commute_vec(
; CHECK-NEXT: [[NEGX:%.*]] = sub nsw <2 x i32> zeroinitializer, [[X:%.*]]
; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i32> [[NEGX]], [[X]]
; CHECK-NEXT: ret <2 x i32> [[DIV]]
;
%negx = sub nsw <2 x i32> zeroinitializer, %x
%div = sdiv <2 x i32> %negx, %x
ret <2 x i32> %div
}
define i32 @knownnegation(i32 %x, i32 %y) {
; CHECK-LABEL: @knownnegation(
; CHECK-NEXT: [[XY:%.*]] = sub nsw i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[YX:%.*]] = sub nsw i32 [[Y]], [[X]]
; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[XY]], [[YX]]
; CHECK-NEXT: ret i32 [[DIV]]
;
%xy = sub nsw i32 %x, %y
%yx = sub nsw i32 %y, %x
%div = sdiv i32 %xy, %yx
ret i32 %div
}
define <2 x i32> @knownnegation_commute_vec(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: @knownnegation_commute_vec(
; CHECK-NEXT: [[XY:%.*]] = sub nsw <2 x i32> [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[YX:%.*]] = sub nsw <2 x i32> [[Y]], [[X]]
; CHECK-NEXT: [[DIV:%.*]] = sdiv <2 x i32> [[XY]], [[YX]]
; CHECK-NEXT: ret <2 x i32> [[DIV]]
;
%xy = sub nsw <2 x i32> %x, %y
%yx = sub nsw <2 x i32> %y, %x
%div = sdiv <2 x i32> %xy, %yx
ret <2 x i32> %div
}