llvm-6502/test/Transforms/Reassociate/basictest3.ll

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; RUN: opt < %s -reassociate -gvn -S | grep add | count 6
; Each of these functions should turn into two adds each.
@e = external global i32 ; <i32*> [#uses=3]
@a = external global i32 ; <i32*> [#uses=3]
@b = external global i32 ; <i32*> [#uses=3]
@c = external global i32 ; <i32*> [#uses=3]
@f = external global i32 ; <i32*> [#uses=3]
define void @test1() {
%A = load i32* @a ; <i32> [#uses=2]
%B = load i32* @b ; <i32> [#uses=2]
%C = load i32* @c ; <i32> [#uses=2]
%t1 = add i32 %A, %B ; <i32> [#uses=1]
%t2 = add i32 %t1, %C ; <i32> [#uses=1]
%t3 = add i32 %C, %A ; <i32> [#uses=1]
%t4 = add i32 %t3, %B ; <i32> [#uses=1]
; e = (a+b)+c;
store i32 %t2, i32* @e
; f = (a+c)+b
store i32 %t4, i32* @f
ret void
}
define void @test2() {
%A = load i32* @a ; <i32> [#uses=2]
%B = load i32* @b ; <i32> [#uses=2]
%C = load i32* @c ; <i32> [#uses=2]
%t1 = add i32 %A, %B ; <i32> [#uses=1]
%t2 = add i32 %t1, %C ; <i32> [#uses=1]
%t3 = add i32 %C, %A ; <i32> [#uses=1]
%t4 = add i32 %t3, %B ; <i32> [#uses=1]
; e = c+(a+b)
store i32 %t2, i32* @e
; f = (c+a)+b
store i32 %t4, i32* @f
ret void
}
define void @test3() {
%A = load i32* @a ; <i32> [#uses=2]
%B = load i32* @b ; <i32> [#uses=2]
%C = load i32* @c ; <i32> [#uses=2]
%t1 = add i32 %B, %A ; <i32> [#uses=1]
%t2 = add i32 %t1, %C ; <i32> [#uses=1]
%t3 = add i32 %C, %A ; <i32> [#uses=1]
%t4 = add i32 %t3, %B ; <i32> [#uses=1]
; e = c+(b+a)
store i32 %t2, i32* @e
; f = (c+a)+b
store i32 %t4, i32* @f
ret void
}