[llvm] [LegalizeDAG][X86][AArch64][LoongArch] Freeze index when converting extract_elt/extract_subvector to load/store on stack. (PR #88985)

[Craig Topper via llvm-commits]

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@@ -490,69 +519,92 @@ define <4 x float> @var_shuffle_v4f32(<4 x float> %v, <4 x i32> %indices) nounwi
 define <16 x i8> @var_shuffle_v16i8_from_v16i8_v32i8(<16 x i8> %v, <32 x i8> %indices) nounwind {
 ; SSE3-LABEL: var_shuffle_v16i8_from_v16i8_v32i8:
 ; SSE3:       # %bb.0:
+; SSE3-NEXT:    pushq %rbp
+; SSE3-NEXT:    pushq %r15
+; SSE3-NEXT:    pushq %r14
+; SSE3-NEXT:    pushq %r13
+; SSE3-NEXT:    pushq %r12
+; SSE3-NEXT:    pushq %rbx
 ; SSE3-NEXT:    movaps %xmm1, -{{[0-9]+}}(%rsp)
-; SSE3-NEXT:    movaps %xmm0, -{{[0-9]+}}(%rsp)
 ; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %eax
+; SSE3-NEXT:    movb %al, {{[-0-9]+}}(%r{{[sb]}}p) # 1-byte Spill
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %ecx
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %edx
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %esi
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %edi
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %r8d
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %r9d
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %r10d
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %r11d
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %ebx
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %ebp
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %r14d
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %r15d
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %r12d
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %r13d
+; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %eax
+; SSE3-NEXT:    movaps %xmm0, -{{[0-9]+}}(%rsp)
+; SSE3-NEXT:    movzbl %al, %eax
 ; SSE3-NEXT:    andl $15, %eax
 ; SSE3-NEXT:    movzbl -24(%rsp,%rax), %eax
 ; SSE3-NEXT:    movd %eax, %xmm1
-; SSE3-NEXT:    movzbl -{{[0-9]+}}(%rsp), %eax
+; SSE3-NEXT:    movzbl %r13b, %eax
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topperc wrote:

I think this is (any_extend (freeze (load))). Can we form an anyext load with a freeze in the middle?

https://github.com/llvm/llvm-project/pull/88985