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amd64 csu: microoptimize startup

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(cherry picked from commit cb991a228179639cc0568fdd5d4b4b07b6f47b5a)
This commit is contained in:
Konstantin Belousov 2025-03-03 01:54:24 +02:00
parent 3733546de3
commit dc1467c68d
1 changed files with 6 additions and 9 deletions
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15
lib/csu/amd64/crt1_s.S
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@ -49,15 +49,12 @@ _start:
#ifdef GCRT
subq $16, %rsp
#endif
movq %rsi, %rcx
movq %rdi, %rsi /* argv = ap */
addq $8, %rsi /* argv += 1 */
movq %rdi, %rdx /* env = ap */
addq $16, %rdx /* env += 2 */
movslq (%rdi), %rax
movl %eax, %edi /* argc = *(long *)(void *)ap */
shlq $3, %rax
addq %rax, %rdx /* env += argc */
movq %rsi, %rcx /* cleanup */
movslq (%rdi), %rax /* long *ap; tmpargc = *ap */
leaq 0x8(%rdi), %rsi /* argv = ap + 1 */
leaq 0x10(%rdi, %rax, 8), %rdx /* env = ap + 2 + tmpargc */
movl %eax, %edi /* argc = tmpargc */
#ifdef PIC
/*
* XXX. %rip relative addressing is not intended for use in the