[llvm] [X86] abs i8 - perform as abs i32 if we have access to CMOV (PR #95101)

[Phoebe Wang via llvm-commits]

================
@@ -485,127 +484,120 @@ define <16 x i8> @test_v16i8(<16 x i8> %a) nounwind {
 ;
 ; X86-LABEL: test_v16i8:
 ; X86:       # %bb.0:
+; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    pushl %ebx
-; X86-NEXT:    subl $12, %esp
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %bh
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %bl
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %dh
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %ch
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %ah
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %dl
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %cl
-; X86-NEXT:    movb %cl, %al
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %cl
-; X86-NEXT:    subb %al, %cl
-; X86-NEXT:    movb %cl, {{[-0-9]+}}(%e{{[sb]}}p) # 1-byte Spill
-; X86-NEXT:    movb %dl, %al
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %dl
-; X86-NEXT:    subb %al, %dl
-; X86-NEXT:    movb %dl, {{[-0-9]+}}(%e{{[sb]}}p) # 1-byte Spill
-; X86-NEXT:    movb %ah, %al
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %ah
-; X86-NEXT:    subb %al, %ah
-; X86-NEXT:    movb %ah, {{[-0-9]+}}(%e{{[sb]}}p) # 1-byte Spill
-; X86-NEXT:    movb %ch, %al
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %ch
-; X86-NEXT:    subb %al, %ch
-; X86-NEXT:    movb %ch, {{[-0-9]+}}(%e{{[sb]}}p) # 1-byte Spill
-; X86-NEXT:    movb %dh, %al
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %dh
-; X86-NEXT:    subb %al, %dh
-; X86-NEXT:    movb %dh, {{[-0-9]+}}(%e{{[sb]}}p) # 1-byte Spill
-; X86-NEXT:    movl %ebx, %eax
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %bl
-; X86-NEXT:    subb %al, %bl
-; X86-NEXT:    movb %bl, {{[-0-9]+}}(%e{{[sb]}}p) # 1-byte Spill
-; X86-NEXT:    movb %bh, %al
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %bh
-; X86-NEXT:    subb %al, %bh
-; X86-NEXT:    movb %bh, {{[-0-9]+}}(%e{{[sb]}}p) # 1-byte Spill
-; X86-NEXT:    movzbl {{[0-9]+}}(%esp), %ecx
-; X86-NEXT:    movl %ecx, %eax
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %cl
-; X86-NEXT:    subb %al, %cl
-; X86-NEXT:    movb %cl, {{[-0-9]+}}(%e{{[sb]}}p) # 1-byte Spill
-; X86-NEXT:    movzbl {{[0-9]+}}(%esp), %ecx
-; X86-NEXT:    movl %ecx, %eax
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %cl
-; X86-NEXT:    subb %al, %cl
-; X86-NEXT:    movb %cl, {{[-0-9]+}}(%e{{[sb]}}p) # 1-byte Spill
-; X86-NEXT:    movzbl {{[0-9]+}}(%esp), %ecx
-; X86-NEXT:    movl %ecx, %eax
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %cl
-; X86-NEXT:    subb %al, %cl
-; X86-NEXT:    movb %cl, {{[-0-9]+}}(%e{{[sb]}}p) # 1-byte Spill
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %bh
-; X86-NEXT:    movb %bh, %al
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %bh
-; X86-NEXT:    subb %al, %bh
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %bl
-; X86-NEXT:    movl %ebx, %eax
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %bl
-; X86-NEXT:    subb %al, %bl
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %dh
-; X86-NEXT:    movb %dh, %al
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %dh
-; X86-NEXT:    subb %al, %dh
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %ch
-; X86-NEXT:    movb %ch, %al
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %ch
-; X86-NEXT:    subb %al, %ch
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %dl
-; X86-NEXT:    movl %edx, %eax
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %dl
-; X86-NEXT:    subb %al, %dl
-; X86-NEXT:    movb {{[0-9]+}}(%esp), %cl
-; X86-NEXT:    movl %ecx, %eax
-; X86-NEXT:    sarb $7, %al
-; X86-NEXT:    xorb %al, %cl
-; X86-NEXT:    subb %al, %cl
+; X86-NEXT:    pushl %edi
+; X86-NEXT:    pushl %esi
+; X86-NEXT:    subl $40, %esp
+; X86-NEXT:    movsbl {{[0-9]+}}(%esp), %eax
+; X86-NEXT:    movsbl {{[0-9]+}}(%esp), %ecx
+; X86-NEXT:    movsbl {{[0-9]+}}(%esp), %edx
+; X86-NEXT:    movsbl {{[0-9]+}}(%esp), %esi
+; X86-NEXT:    movsbl {{[0-9]+}}(%esp), %edi
+; X86-NEXT:    movsbl {{[0-9]+}}(%esp), %ebx
+; X86-NEXT:    movl %ebx, %ebp
+; X86-NEXT:    negl %ebp
+; X86-NEXT:    cmovsl %ebx, %ebp
+; X86-NEXT:    movl %ebp, {{[-0-9]+}}(%e{{[sb]}}p) # 4-byte Spill
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phoebewang wrote:

It also increases spill/reload size.

https://github.com/llvm/llvm-project/pull/95101