search for: typhandl

Hi Arushi, > I got this from C code compiled by llvm-gcc. > > There is a consistent prototype for the function > > TypHandle Cyclotomic ( hdRes, n, m ) > TypHandle hdRes; > long n, m; I just remembered that Kernighan and Ritchie style declarations like this don't have the semantics you might expect. In particular this is not equivalent to saying TypHandle Cy...

...they are the same but differ on > 64 bit > platforms. Of course it could also be a compiler bug. You got this from > compiling Fortran with dragonegg, right? What was the original code? > I got this from C code compiled by llvm-gcc. There is a consistent prototype for the function TypHandle Cyclotomic ( hdRes, n, m ) TypHandle hdRes; long n, m; the call looks as follows, hdI = ProdCyc( hdI, Cyclotomic( HdResult, n, 1 ) ); which is basically Cyclotomic( HdResult, n, 1 ); The problem is the fact that it interprets 1 as an int32 instead of an...

Hi Arushi, > When it asks for the castOpcode, it assumes both types are unsigned(indicated by > the false arguments). > > Is it correct to assume this? yes, because the behaviour of the original code was undefined. Ciao, Duncan. PS: This is the sort of thing that happens when a function is declared with a prototype such as void *Cyclotomic(void *, long, int) but the function

...ail to run with reference input. The root cause is that the compiler mistakenly optimizes expr "x * y / y" into x where the x*y is blindly flagged with nsw without any analysis. The preproceeded code is excerpted bellow: cat -n integer.i --------------------------------- 2361 TypHandle ProdInt ( hdL, hdR ) 2362 TypHandle hdL, hdR; 2363 { .... 2373 if ( (int)hdL & (int)hdR & 1 ) { 2374 2375 2376 i = ((int)hdL - 1) * ((int)hdR >> 1); /* !!! No barbaric NSW, please !!! */ 2377 if ( ((int)hdR >> 1) == 0 || i / ((int)hdR >> 1) == (...

Hi Arushi, > I got this from C code compiled by llvm-gcc. > > There is a consistent prototype for the function > > TypHandle Cyclotomic ( hdRes, n, m ) > TypHandle hdRes; > long n, m; > > the call looks as follows, > hdI = ProdCyc( hdI, Cyclotomic( HdResult, n, 1 ) ); I bet the call occurs before the function is defined. In this case C treats the callee as bei...

On Wed, Apr 6, 2011 at 8:35 AM, Duncan Sands <baldrick at free.fr> wrote: > Hi Arushi, > > > I got this from C code compiled by llvm-gcc. >> >> There is a consistent prototype for the function >> >> TypHandle Cyclotomic ( hdRes, n, m ) >> TypHandle hdRes; >> long n, m; >> >> the call looks as follows, >> hdI = ProdCyc( hdI, Cyclotomic( HdResult, n, 1 ) ); >> > > I bet the call occurs before the function is defined. In t...

...gt; The root cause is that the compiler mistakenly optimizes expr "x * y / y" into x where the x*y is blindly > flagged with nsw without any analysis. > > The preproceeded code is excerpted bellow: > > cat -n integer.i > --------------------------------- > 2361 TypHandle ProdInt ( hdL, hdR ) > 2362 TypHandle hdL, hdR; > 2363 { > .... > 2373 if ( (int)hdL & (int)hdR & 1 ) { > 2374 > 2375 > 2376 i = ((int)hdL - 1) * ((int)hdR >> 1); /* !!! No barbaric NSW, please !!! */ > 2377 if ( ((int)hdR >> 1)...