[llvm] [RISCV][P-ext] Recognize vector shifts with splat build_vector shift amount. (PR #184909)

[Craig Topper via llvm-commits]

================
@@ -1763,3 +1763,75 @@ define <4 x i8> @test_vselect_v4i8(<4 x i8> %a, <4 x i8> %b, <4 x i8> %c) {
   %res = select <4 x i1> %mask, <4 x i8> %c, <4 x i8> %b
   ret <4 x i8> %res
 }
+
+define <2 x i16> @test_bswap_v2i16(<2 x i16> %a) {
+; CHECK-LABEL: test_bswap_v2i16:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    psrli.h a1, a0, 8
+; CHECK-NEXT:    pslli.h a0, a0, 8
+; CHECK-NEXT:    or a0, a0, a1
----------------
topperc wrote:

Yep. I noticed that too.

https://github.com/llvm/llvm-project/pull/184909