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x64 NDR: Avoid pushes/pops for host_x86_MOV32_REG_ABS

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Cacodemon345
2025-05-10 12:57:27 +06:00
parent 1dd460e9a4
commit b179955a12
1 changed files with 4 additions and 5 deletions
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9
src/codegen_new/codegen_backend_x86-64_ops.c
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@@ -785,12 +785,11 @@ host_x86_MOV32_REG_ABS(codeblock_t *block, int dst_reg, void *p)
// void *q = p;
//uint32_t *r = NULL;
// *r = 5; /* Crash deliberately. */
codegen_alloc_bytes(block, 18);
codegen_addbyte2(block, 0x41, 0x54); /*PUSH r12*/
codegen_addbyte2(block, 0x49, 0xbc); /*MOV r12,(uintptr_t) p*/
codegen_alloc_bytes(block, 8);
codegen_addbyte2(block, 0x49, 0xb9); /*MOV r9,(uintptr_t) p*/
codegen_addquad(block, (uintptr_t) p);
codegen_addbyte4(block, 0x41, 0x8b, 0x04 | ((dst_reg & 7) << 3), 0x24); /*MOV dst_reg, [R12]*/
codegen_addbyte2(block, 0x41, 0x5c); /*POP r12*/
codegen_alloc_bytes(block, 3);
codegen_addbyte3(block, 0x41, 0x8b, 0x01 | ((dst_reg & 7) << 3)); /*MOV dst_reg, [R9]*/
} else {
fatal("host_x86_MOV32_REG_ABS - RAM offset = %016" PRIX64 " (p - ram = %016" PRIX64 ")\n", ram_offset, (uintptr_t) p - (uintptr_t) ram);
codegen_alloc_bytes(block, 6);