[DAGCombiner] Add target hook function to decide folding (mul (add x, c1), c2)

[llvm-project.git] / llvm / test / Transforms / Reassociate / shifttest.ll

; With shl->mul reassociation, we can see that this is (shl A, 9) * A
;
; RUN: opt < %s -reassociate -instcombine -S |\
; RUN:    grep "shl .*, 9"

define i32 @test(i32 %A, i32 %B) {
        %X = shl i32 %A, 5              ; <i32> [#uses=1]
        %Y = shl i32 %A, 4              ; <i32> [#uses=1]
        %Z = mul i32 %Y, %X             ; <i32> [#uses=1]
        ret i32 %Z
}