[llvm-commits] [llvm] r58104 - in /llvm/trunk/lib/Target: README.txt X86/README.txt
Torok Edwin
edwintorok at gmail.com
Fri Oct 24 12:23:07 PDT 2008
Author: edwin
Date: Fri Oct 24 14:23:07 2008
New Revision: 58104
URL: http://llvm.org/viewvc/llvm-project?rev=58104&view=rev
Log:
move the note to the correct README
Modified:
llvm/trunk/lib/Target/README.txt
llvm/trunk/lib/Target/X86/README.txt
Modified: llvm/trunk/lib/Target/README.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/README.txt?rev=58104&r1=58103&r2=58104&view=diff
==============================================================================
--- llvm/trunk/lib/Target/README.txt (original)
+++ llvm/trunk/lib/Target/README.txt Fri Oct 24 14:23:07 2008
@@ -984,98 +984,3 @@
}
//===---------------------------------------------------------------------===//
-
-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
Modified: llvm/trunk/lib/Target/X86/README.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/README.txt?rev=58104&r1=58103&r2=58104&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/README.txt (original)
+++ llvm/trunk/lib/Target/X86/README.txt Fri Oct 24 14:23:07 2008
@@ -1676,3 +1676,100 @@
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
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