Created
May 30, 2023 16:34
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Strlen SSE 4.2
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| .intel_syntax noprefix | |
| .file "__strlen_sse42" | |
| .section .text, "ax" | |
| .globl __vs_strlen_sse42 | |
| __vs_strlen_sse42: | |
| endbr64 | |
| xor rax, rax | |
| test rdi, rdi | |
| jz .L_null | |
| mov rdx, rdi | |
| pxor xmm0, xmm0 | |
| .L_loop: | |
| pcmpistri xmm0, xmmword ptr [rdx+rax*1], 0b1000 | |
| add eax, ecx | |
| test ecx, ecx | |
| jnz .L_loop | |
| .L_null: | |
| ret |
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