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[kvm-devel] [PATCH 1/11] KVM: optimize inline assembly
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From: Avi K. <av...@qu...> - 2007-01-30 14:37:04
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From: Ingo Molnar <mi...@el...> forms like "0(%rsp)" generate an instruction with an unnecessary one byte displacement under certain circumstances. replace with the equivalent "(%rsp)". Signed-off-by: Avi Kivity <av...@qu...> Index: linux-2.6/drivers/kvm/vmx.c =================================================================== --- linux-2.6.orig/drivers/kvm/vmx.c +++ linux-2.6/drivers/kvm/vmx.c @@ -1784,10 +1784,10 @@ again: "kvm_vmx_return: " /* Save guest registers, load host registers, keep flags */ #ifdef CONFIG_X86_64 - "xchg %3, 0(%%rsp) \n\t" + "xchg %3, (%%rsp) \n\t" "mov %%rax, %c[rax](%3) \n\t" "mov %%rbx, %c[rbx](%3) \n\t" - "pushq 0(%%rsp); popq %c[rcx](%3) \n\t" + "pushq (%%rsp); popq %c[rcx](%3) \n\t" "mov %%rdx, %c[rdx](%3) \n\t" "mov %%rsi, %c[rsi](%3) \n\t" "mov %%rdi, %c[rdi](%3) \n\t" @@ -1802,24 +1802,24 @@ again: "mov %%r15, %c[r15](%3) \n\t" "mov %%cr2, %%rax \n\t" "mov %%rax, %c[cr2](%3) \n\t" - "mov 0(%%rsp), %3 \n\t" + "mov (%%rsp), %3 \n\t" "pop %%rcx; pop %%r15; pop %%r14; pop %%r13; pop %%r12;" "pop %%r11; pop %%r10; pop %%r9; pop %%r8;" "pop %%rbp; pop %%rdi; pop %%rsi;" "pop %%rdx; pop %%rbx; pop %%rax \n\t" #else - "xchg %3, 0(%%esp) \n\t" + "xchg %3, (%%esp) \n\t" "mov %%eax, %c[rax](%3) \n\t" "mov %%ebx, %c[rbx](%3) \n\t" - "pushl 0(%%esp); popl %c[rcx](%3) \n\t" + "pushl (%%esp); popl %c[rcx](%3) \n\t" "mov %%edx, %c[rdx](%3) \n\t" "mov %%esi, %c[rsi](%3) \n\t" "mov %%edi, %c[rdi](%3) \n\t" "mov %%ebp, %c[rbp](%3) \n\t" "mov %%cr2, %%eax \n\t" "mov %%eax, %c[cr2](%3) \n\t" - "mov 0(%%esp), %3 \n\t" + "mov (%%esp), %3 \n\t" "pop %%ecx; popa \n\t" #endif |
