[llvm] r292035 - [InstCombine] add test to show missed vector fold; NFC

[Sean Silva via llvm-commits]

Can you add a comment with a FIXME explaining what we want it to eventually
do?

On Sat, Jan 14, 2017 at 3:12 PM, Sanjay Patel via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> Author: spatel
> Date: Sat Jan 14 17:12:29 2017
> New Revision: 292035
>
> URL: http://llvm.org/viewvc/llvm-project?rev=292035&view=rev
> Log:
> [InstCombine] add test to show missed vector fold; NFC
>
> Modified:
>     llvm/trunk/test/Transforms/InstCombine/signext.ll
>
> Modified: llvm/trunk/test/Transforms/InstCombine/signext.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/
> Transforms/InstCombine/signext.ll?rev=292035&r1=292034&r2=292035&view=diff
> ============================================================
> ==================
> --- llvm/trunk/test/Transforms/InstCombine/signext.ll (original)
> +++ llvm/trunk/test/Transforms/InstCombine/signext.ll Sat Jan 14 17:12:29
> 2017
> @@ -72,6 +72,19 @@ define i32 @test6(i16 %P) {
>    ret i32 %tmp.5
>  }
>
> +define <2 x i32> @test6_splat_vec(<2 x i12> %P) {
> +; CHECK-LABEL: @test6_splat_vec(
> +; CHECK-NEXT:    [[Z:%.*]] = zext <2 x i12> %P to <2 x i32>
> +; CHECK-NEXT:    [[SHL:%.*]] = shl nuw <2 x i32> [[Z]], <i32 20, i32 20>
> +; CHECK-NEXT:    [[ASHR:%.*]] = ashr <2 x i32> [[SHL]], <i32 20, i32 20>
> +; CHECK-NEXT:    ret <2 x i32> [[ASHR]]
> +;
> +  %z = zext <2 x i12> %P to <2 x i32>
> +  %shl = shl <2 x i32> %z, <i32 20, i32 20>
> +  %ashr = ashr <2 x i32> %shl, <i32 20, i32 20>
> +  ret <2 x i32> %ashr
> +}
> +
>  define i32 @test7(i32 %x) {
>  ; CHECK-LABEL: @test7(
>  ; CHECK-NEXT:    [[SUB:%.*]] = ashr i32 %x, 5
>
>
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