[llvm] [X86][SelectionDAG] Fix the Gather's base and index by modifying the Scale value (PR #134979)

[Rohit Aggarwal via llvm-commits]

================
@@ -5094,11 +5047,13 @@ define {<16 x float>, <16 x float>} @test_gather_16f32_mask_index_pair(ptr %x, p
 ; X86-SKX-NEXT:    vpmovd2m %zmm0, %k1
 ; X86-SKX-NEXT:    movl {{[0-9]+}}(%esp), %eax
 ; X86-SKX-NEXT:    movl {{[0-9]+}}(%esp), %ecx
-; X86-SKX-NEXT:    vpslld $4, (%ecx), %zmm2
+; X86-SKX-NEXT:    vmovdqu64 (%ecx), %zmm0
+; X86-SKX-NEXT:    vpandd {{\.?LCPI[0-9]+_[0-9]+}}{1to16}, %zmm0, %zmm0
+; X86-SKX-NEXT:    vpaddd %zmm0, %zmm0, %zmm2
----------------
rohitaggarwal007 wrote:

Implemented a logic to do this.

https://github.com/llvm/llvm-project/pull/134979