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[NFC][testcases] add testcases for folding srem whose operands are negatived. 

Finish same optimization for add instruction in D49216 and sdiv instruction in 
D49382. This patch is for srem instruction.

llvm-svn: 337270
This commit is contained in:
Chen Zheng 2018-07-17 12:31:54 +00:00
parent 7f457d79ec
commit fcfcf07104
1 changed files with 49 additions and 0 deletions
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49
llvm/test/Transforms/InstSimplify/srem.ll Normal file
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; RUN: opt < %s -instsimplify -S | FileCheck %s
define i32 @negated_operand(i32 %x) {
; CHECK-LABEL: @negated_operand(
; CHECK-NEXT: [[NEGX:%.*]] = sub i32 0, [[X:%.*]]
; CHECK-NEXT: [[REM:%.*]] = srem i32 [[NEGX]], [[X]]
; CHECK-NEXT: ret i32 [[REM]]
;
%negx = sub i32 0, %x
%rem = srem i32 %negx, %x
ret i32 %rem
}
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: [[REM:%.*]] = srem <2 x i32> [[NEGX]], [[X]]
; CHECK-NEXT: ret <2 x i32> [[REM]]
;
%negx = sub nsw <2 x i32> zeroinitializer, %x
%rem = srem <2 x i32> %negx, %x
ret <2 x i32> %rem
}
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: [[REM:%.*]] = srem i32 [[XY]], [[YX]]
; CHECK-NEXT: ret i32 [[REM]]
;
%xy = sub nsw i32 %x, %y
%yx = sub nsw i32 %y, %x
%rem = srem i32 %xy, %yx
ret i32 %rem
}
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: [[REM:%.*]] = srem <2 x i32> [[XY]], [[YX]]
; CHECK-NEXT: ret <2 x i32> [[REM]]
;
%xy = sub nsw <2 x i32> %x, %y
%yx = sub nsw <2 x i32> %y, %x
%rem = srem <2 x i32> %xy, %yx
ret <2 x i32> %rem
}