MSVC version of the two functions

gistfile1.asm

; http://stackoverflow.com/questions/10250419/why-does-gcc-generate-such-radically-different-assembly-for-nearly-the-same-c-co
PUBLIC	?fast_trunc_one@@YAHH@Z				; fast_trunc_one
; Function compile flags: /Ogtpy
_TEXT	SEGMENT
_i$ = 8							; size = 4
?fast_trunc_one@@YAHH@Z PROC				; fast_trunc_one
; File c:\program files (x86)\microsoft visual studio 10.0\vc\bin\c2.cpp
; Line 6
	mov	eax, DWORD PTR _i$[esp-4]
	push	esi
; Line 7
	mov	esi, eax
	sar	esi, 23					; 00000017H
	mov	edx, eax
	and	esi, 255				; 000000ffH
	and	edx, 8388607				; 007fffffH
	mov	ecx, 150				; 00000096H
	sub	ecx, esi
	or	edx, 8388608				; 00800000H
; Line 8
	and	eax, -2147483648			; 80000000H
	pop	esi
; Line 12
	test	ecx, ecx
	jns	SHORT $LN2@fast_trunc
; Line 13
	neg	ecx
	shl	edx, cl
; Line 15
	add	edx, eax
; Line 18
	neg	eax
	xor	eax, edx
; Line 19
	ret	0
$LN2@fast_trunc:
; Line 15
	sar	edx, cl
	add	edx, eax
; Line 18
	neg	eax
	xor	eax, edx
; Line 19
	ret	0
?fast_trunc_one@@YAHH@Z ENDP				; fast_trunc_one
_TEXT	ENDS
PUBLIC	?fast_trunc_two@@YAHH@Z				; fast_trunc_two
; Function compile flags: /Ogtpy
_TEXT	SEGMENT
_i$ = 8							; size = 4
?fast_trunc_two@@YAHH@Z PROC				; fast_trunc_two
; Line 24
	mov	edx, DWORD PTR _i$[esp-4]
	push	esi
; Line 25
	mov	esi, edx
	sar	esi, 23					; 00000017H
	mov	eax, edx
	and	esi, 255				; 000000ffH
	and	eax, 8388607				; 007fffffH
	mov	ecx, 150				; 00000096H
	sub	ecx, esi
	or	eax, 8388608				; 00800000H
; Line 26
	and	edx, -2147483648			; 80000000H
	pop	esi
; Line 30
	test	ecx, ecx
	jns	SHORT $LN2@fast_trunc@2
; Line 31
	neg	ecx
	shl	eax, cl
; Line 33
	mov	ecx, edx
	neg	ecx
	xor	eax, ecx
	add	eax, edx
; Line 37
	ret	0
$LN2@fast_trunc@2:
; Line 33
	sar	eax, cl
	mov	ecx, edx
	neg	ecx
	xor	eax, ecx
	add	eax, edx
; Line 37
	ret	0
?fast_trunc_two@@YAHH@Z ENDP				; fast_trunc_two
_TEXT	ENDS