Displaying 6 results from an estimated 6 matches for "__ftol2".
Did you mean:
_ftol2
2012 Jan 18
2
[LLVMdev] Best way to interface with MSVC _ftol2 runtime function for fptoui?
...sions, but this
function has a nonstandard calling convention LLVM doesn't understand.
It takes its input operand on the x87 stack as ST0, which it pops off
of the stack before returning. The return value is given in EDX:EAX.
In effect, I need to call it like this:
%1 = call i64 asm "call __ftol2",
"=A,{st},~{dirflag},~{fpsr},~{flags}" (double %x) nounwind
but with the added consideration that the input operand is popped by
the call, so the callee can't emit its own fstp instruction afterward.
LLVM inline asm doesn't appear to be capable of communicating this. In
#ll...
2012 Jan 19
0
[LLVMdev] Best way to interface with MSVC _ftol2 runtime function for fptoui?
...has a nonstandard calling convention LLVM doesn't understand.
> It takes its input operand on the x87 stack as ST0, which it pops off
> of the stack before returning. The return value is given in EDX:EAX.
> In effect, I need to call it like this:
>
> %1 = call i64 asm "call __ftol2",
> "=A,{st},~{dirflag},~{fpsr},~{flags}" (double %x) nounwind
>
> but with the added consideration that the input operand is popped by
> the call, so the callee can't emit its own fstp instruction afterward.
> LLVM inline asm doesn't appear to be capable of c...
2012 Jan 19
2
[LLVMdev] Best way to interface with MSVC _ftol2 runtime function for fptoui?
2012/1/18 Jakob Stoklund Olesen <stoklund at 2pi.dk>:
> This should work:
> %1 = call i64 asm "call __ftol2", "=A,{st},~{dirflag},~{fpsr},~{flags},~{st}" (double %x) nounwind
Thanks Jakob, the ~{st} constraint does the trick. It wasn't clear to
me that "clobbers" means "pops" for x87 registers.
-Joe
2012 Jan 19
0
[LLVMdev] Best way to interface with MSVC _ftol2 runtime function for fptoui?
2012/1/18 Jakob Stoklund Olesen <stoklund at 2pi.dk>:
> This should work:
> %1 = call i64 asm "call __ftol2", "=A,{st},~{dirflag},~{fpsr},~{flags},~{st}" (double %x) nounwind
Forgive me for being slow, but what would be the best way to implement
the equivalent of that inline asm as a custom lowering for an
instruction? Can I just create a CallInst and tell it to lower that
instead, or do...
2005 Feb 14
8
DONT_RESOLVE_DLL_REFERENCES info
For future reference, it looks like we should avoid
DONT_RESOLVE_DLL_REFERENCES in any extensions.
http://weblogs.asp.net/oldnewthing/archive/2005/02/14/372266.aspx
Regards,
Dan
2012 Jan 19
2
[LLVMdev] Best way to interface with MSVC _ftol2 runtime function for fptoui?
On Jan 18, 2012, at 8:56 PM, Joe Groff wrote:
> 2012/1/18 Jakob Stoklund Olesen <stoklund at 2pi.dk>:
>> This should work:
>> %1 = call i64 asm "call __ftol2", "=A,{st},~{dirflag},~{fpsr},~{flags},~{st}" (double %x) nounwind
>
> Forgive me for being slow, but what would be the best way to implement
> the equivalent of that inline asm as a custom lowering for an
> instruction? Can I just create a CallInst and tell it to lower...