llvm-6502/test/Transforms/Reassociate/2002-05-15-SubReassociate.ll
2014-06-11 18:28:45 +00:00

31 lines
792 B
LLVM

; RUN: opt < %s -reassociate -constprop -instcombine -dce -S | FileCheck %s
; With sub reassociation, constant folding can eliminate all of the constants.
define i32 @test1(i32 %A, i32 %B) {
; CHECK-LABEL: test1
; CHECK-NEXT: %Z = sub i32 %A, %B
; CHECK-NEXT: ret i32 %Z
%W = add i32 5, %B
%X = add i32 -7, %A
%Y = sub i32 %X, %W
%Z = add i32 %Y, 12
ret i32 %Z
}
; With sub reassociation, constant folding can eliminate the two 12 constants.
define i32 @test2(i32 %A, i32 %B, i32 %C, i32 %D) {
; CHECK-LABEL: test2
; CHECK-NEXT: %sum = add i32 %B, %A
; CHECK-NEXT: %sum1 = add i32 %sum, %C
; CHECK-NEXT: %Q = sub i32 %D, %sum1
; CHECK-NEXT: ret i32 %Q
%M = add i32 %A, 12
%N = add i32 %M, %B
%O = add i32 %N, %C
%P = sub i32 %D, %O
%Q = add i32 %P, 12
ret i32 %Q
}