int fna(long long x)
{
	return x % 256;
}


Crazy1.o:     file format pe-i386


Disassembly of section .text:

00000000 <_fna>:
int fna(long long x)
{
   0:	55                   	push   ebp
   1:	89 e5                	mov    ebp,esp
   3:	57                   	push   edi
   4:	56                   	push   esi
   5:	53                   	push   ebx
   6:	83 ec 24             	sub    esp,0x24
   9:	8b 45 08             	mov    eax,DWORD PTR [ebp+0x8]
   c:	89 45 e8             	mov    DWORD PTR [ebp-0x18],eax
   f:	8b 45 0c             	mov    eax,DWORD PTR [ebp+0xc]
  12:	89 45 ec             	mov    DWORD PTR [ebp-0x14],eax
	return x % 256;
  15:	8b 4d e8             	mov    ecx,DWORD PTR [ebp-0x18]
  18:	8b 5d ec             	mov    ebx,DWORD PTR [ebp-0x14]
  1b:	89 d8                	mov    eax,ebx
  1d:	c1 f8 1f             	sar    eax,0x1f
  20:	99                   	cdq    
  21:	89 cf                	mov    edi,ecx
  23:	31 c7                	xor    edi,eax
  25:	89 7d e0             	mov    DWORD PTR [ebp-0x20],edi
  28:	89 df                	mov    edi,ebx
  2a:	31 d7                	xor    edi,edx
  2c:	89 7d e4             	mov    DWORD PTR [ebp-0x1c],edi
  2f:	8b 4d e0             	mov    ecx,DWORD PTR [ebp-0x20]
  32:	8b 5d e4             	mov    ebx,DWORD PTR [ebp-0x1c]
  35:	29 c1                	sub    ecx,eax
  37:	19 d3                	sbb    ebx,edx
  39:	0f b6 f1             	movzx  esi,cl
  3c:	89 75 d8             	mov    DWORD PTR [ebp-0x28],esi
  3f:	89 df                	mov    edi,ebx
  41:	83 e7 00             	and    edi,0x0
  44:	89 7d dc             	mov    DWORD PTR [ebp-0x24],edi
  47:	8b 4d d8             	mov    ecx,DWORD PTR [ebp-0x28]
  4a:	8b 5d dc             	mov    ebx,DWORD PTR [ebp-0x24]
  4d:	89 ce                	mov    esi,ecx
  4f:	31 c6                	xor    esi,eax
  51:	89 75 d0             	mov    DWORD PTR [ebp-0x30],esi
  54:	89 df                	mov    edi,ebx
  56:	31 d7                	xor    edi,edx
  58:	89 7d d4             	mov    DWORD PTR [ebp-0x2c],edi
  5b:	8b 5d d0             	mov    ebx,DWORD PTR [ebp-0x30]
  5e:	8b 75 d4             	mov    esi,DWORD PTR [ebp-0x2c]
  61:	29 c3                	sub    ebx,eax
  63:	19 d6                	sbb    esi,edx
  65:	89 d8                	mov    eax,ebx
  67:	89 f2                	mov    edx,esi
  69:	83 c4 24             	add    esp,0x24
  6c:	5b                   	pop    ebx
  6d:	5e                   	pop    esi
  6e:	5f                   	pop    edi
  6f:	5d                   	pop    ebp
  70:	c3                   	ret    
  71:	90                   	nop
  72:	90                   	nop
  73:	90                   	nop

double remainder(double numer, double denom)
{
	double res;
	asm("fldl %2;"
		"fldl %1;"
		"fprem1;"
		"fstpl %0;"
		"fstp %%st;"
	: "=m"(res)
	: "m"(numer), "m"(denom)
	);
	return res;
}


Rem.o:     file format pe-i386


Disassembly of section .text:

00000000 <_remainder>:
double remainder(double numer, double denom)
{
   0:	55                   	push   ebp
   1:	89 e5                	mov    ebp,esp
   3:	83 ec 20             	sub    esp,0x20
   6:	8b 45 08             	mov    eax,DWORD PTR [ebp+0x8]
   9:	89 45 e8             	mov    DWORD PTR [ebp-0x18],eax
   c:	8b 45 0c             	mov    eax,DWORD PTR [ebp+0xc]
   f:	89 45 ec             	mov    DWORD PTR [ebp-0x14],eax
  12:	8b 45 10             	mov    eax,DWORD PTR [ebp+0x10]
  15:	89 45 e0             	mov    DWORD PTR [ebp-0x20],eax
  18:	8b 45 14             	mov    eax,DWORD PTR [ebp+0x14]
  1b:	89 45 e4             	mov    DWORD PTR [ebp-0x1c],eax
	double res;
	asm("fldl %2;"
  1e:	dd 45 e0             	fld    QWORD PTR [ebp-0x20]
  21:	dd 45 e8             	fld    QWORD PTR [ebp-0x18]
  24:	d9 f5                	fprem1 
  26:	dd 5d f8             	fstp   QWORD PTR [ebp-0x8]
  29:	dd d8                	fstp   st(0)
		"fstpl %0;"
		"fstp %%st;"
	: "=m"(res)
	: "m"(numer), "m"(denom)
	);
	return res;
  2b:	dd 45 f8             	fld    QWORD PTR [ebp-0x8]
}
  2e:	c9                   	leave  
  2f:	c3                   	ret