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move the note to the correct README

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58104 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Torok Edwin 2008-10-24 19:23:07 +00:00
parent db1b3bc276
commit 61df3b751a
2 changed files with 97 additions and 95 deletions
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95
lib/Target/README.txt
View File

@ -984,98 +984,3 @@ define i1 @test(i8 %x) {
}
//===---------------------------------------------------------------------===//
This code:
int foo(const char *str,...)
{
__builtin_va_list a; int x;
__builtin_va_start(a,str); x = __builtin_va_arg(a,int); __builtin_va_end(a);
return x;
}
gets compiled into this on x86-64:
subq $200, %rsp
movaps %xmm7, 160(%rsp)
movaps %xmm6, 144(%rsp)
movaps %xmm5, 128(%rsp)
movaps %xmm4, 112(%rsp)
movaps %xmm3, 96(%rsp)
movaps %xmm2, 80(%rsp)
movaps %xmm1, 64(%rsp)
movaps %xmm0, 48(%rsp)
movq %r9, 40(%rsp)
movq %r8, 32(%rsp)
movq %rcx, 24(%rsp)
movq %rdx, 16(%rsp)
movq %rsi, 8(%rsp)
leaq (%rsp), %rax
movq %rax, 192(%rsp)
leaq 208(%rsp), %rax
movq %rax, 184(%rsp)
movl $48, 180(%rsp)
movl $8, 176(%rsp)
movl 176(%rsp), %eax
cmpl $47, %eax
jbe .LBB1_3 # bb
.LBB1_1: # bb3
movq 184(%rsp), %rcx
leaq 8(%rcx), %rax
movq %rax, 184(%rsp)
.LBB1_2: # bb4
movl (%rcx), %eax
addq $200, %rsp
ret
.LBB1_3: # bb
movl %eax, %ecx
addl $8, %eax
addq 192(%rsp), %rcx
movl %eax, 176(%rsp)
jmp .LBB1_2 # bb4
gcc 4.3 generates:
subq $96, %rsp
.LCFI0:
leaq 104(%rsp), %rax
movq %rsi, -80(%rsp)
movl $8, -120(%rsp)
movq %rax, -112(%rsp)
leaq -88(%rsp), %rax
movq %rax, -104(%rsp)
movl $8, %eax
cmpl $48, %eax
jb .L6
movq -112(%rsp), %rdx
movl (%rdx), %eax
addq $96, %rsp
ret
.p2align 4,,10
.p2align 3
.L6:
mov %eax, %edx
addq -104(%rsp), %rdx
addl $8, %eax
movl %eax, -120(%rsp)
movl (%rdx), %eax
addq $96, %rsp
ret
and it gets compiled into this on x86:
pushl %ebp
movl %esp, %ebp
subl $4, %esp
leal 12(%ebp), %eax
movl %eax, -4(%ebp)
leal 16(%ebp), %eax
movl %eax, -4(%ebp)
movl 12(%ebp), %eax
addl $4, %esp
popl %ebp
ret
gcc 4.3 generates:
pushl %ebp
movl %esp, %ebp
movl 12(%ebp), %eax
popl %ebp
ret

97
lib/Target/X86/README.txt
View File

@ -1676,3 +1676,100 @@ _test:
ret
it would be better to codegen as: x+~y (notl+addl)
//===---------------------------------------------------------------------===//
This code:
int foo(const char *str,...)
{
__builtin_va_list a; int x;
__builtin_va_start(a,str); x = __builtin_va_arg(a,int); __builtin_va_end(a);
return x;
}
gets compiled into this on x86-64:
subq $200, %rsp
movaps %xmm7, 160(%rsp)
movaps %xmm6, 144(%rsp)
movaps %xmm5, 128(%rsp)
movaps %xmm4, 112(%rsp)
movaps %xmm3, 96(%rsp)
movaps %xmm2, 80(%rsp)
movaps %xmm1, 64(%rsp)
movaps %xmm0, 48(%rsp)
movq %r9, 40(%rsp)
movq %r8, 32(%rsp)
movq %rcx, 24(%rsp)
movq %rdx, 16(%rsp)
movq %rsi, 8(%rsp)
leaq (%rsp), %rax
movq %rax, 192(%rsp)
leaq 208(%rsp), %rax
movq %rax, 184(%rsp)
movl $48, 180(%rsp)
movl $8, 176(%rsp)
movl 176(%rsp), %eax
cmpl $47, %eax
jbe .LBB1_3 # bb
.LBB1_1: # bb3
movq 184(%rsp), %rcx
leaq 8(%rcx), %rax
movq %rax, 184(%rsp)
.LBB1_2: # bb4
movl (%rcx), %eax
addq $200, %rsp
ret
.LBB1_3: # bb
movl %eax, %ecx
addl $8, %eax
addq 192(%rsp), %rcx
movl %eax, 176(%rsp)
jmp .LBB1_2 # bb4
gcc 4.3 generates:
subq $96, %rsp
.LCFI0:
leaq 104(%rsp), %rax
movq %rsi, -80(%rsp)
movl $8, -120(%rsp)
movq %rax, -112(%rsp)
leaq -88(%rsp), %rax
movq %rax, -104(%rsp)
movl $8, %eax
cmpl $48, %eax
jb .L6
movq -112(%rsp), %rdx
movl (%rdx), %eax
addq $96, %rsp
ret
.p2align 4,,10
.p2align 3
.L6:
mov %eax, %edx
addq -104(%rsp), %rdx
addl $8, %eax
movl %eax, -120(%rsp)
movl (%rdx), %eax
addq $96, %rsp
ret
and it gets compiled into this on x86:
pushl %ebp
movl %esp, %ebp
subl $4, %esp
leal 12(%ebp), %eax
movl %eax, -4(%ebp)
leal 16(%ebp), %eax
movl %eax, -4(%ebp)
movl 12(%ebp), %eax
addl $4, %esp
popl %ebp
ret
gcc 4.3 generates:
pushl %ebp
movl %esp, %ebp
movl 12(%ebp), %eax
popl %ebp
ret