forked from OSchip/llvm-project
29 lines
745 B
LLVM
29 lines
745 B
LLVM
|
; RUN: opt < %s -reassociate -instcombine -S | FileCheck %s
|
||
|
|
|
||
|
|
; With sub reassociation, constant folding can eliminate the 12 and -12 constants.
|
||
|
|
define i32 @test1(i32 %A, i32 %B) {
|
||
|
|
; CHECK-LABEL: @test1(
|
||
|
|
; CHECK-NEXT: [[Z:%.*]] = sub i32 %A, %B
|
||
|
|
; CHECK-NEXT: ret i32 [[Z]]
|
||
|
|
;
|
||
|
|
%X = add i32 -12, %A
|
||
|
|
%Y = sub i32 %X, %B
|
||
|
|
%Z = add i32 %Y, 12
|
||
|
|
ret i32 %Z
|
||
|
|
}
|
||
|
|
|
||
|
|
; PR2047
|
||
|
|
; With sub reassociation, constant folding can eliminate the uses of %a.
|
||
|
|
define i32 @test2(i32 %a, i32 %b, i32 %c) {
|
||
|
|
; CHECK-LABEL: @test2(
|
||
|
|
; CHECK-NEXT: [[SUM:%.*]] = add i32 %c, %b
|
||
|
|
; CHECK-NEXT: [[TMP7:%.*]] = sub i32 0, [[SUM]]
|
||
|
|
; CHECK-NEXT: ret i32 [[TMP7]]
|
||
|
|
;
|
||
|
|
%tmp3 = sub i32 %a, %b
|
||
|
|
%tmp5 = sub i32 %tmp3, %c
|
||
|
|
%tmp7 = sub i32 %tmp5, %a
|
||
|
|
ret i32 %tmp7
|
||
|
|
}
|
||
|
|
|