Displaying 3 results from an estimated 3 matches for "__nothrow__".
2012 Nov 29
2
[LLVMdev] problem trying to write an LLVM register-allocation pass
I have a new problem: Register RBP is used in a function foo. (I am not
allocating RBP to any virtual register, the instances of RBP in function
foo are in the machine code when my register allocator starts.)
Function foo calls function bar. Register RBP is not saved across the
call, though it is live after the call. Function bar includes a virtual
register. The code that I'm using to
2012 Dec 01
0
[LLVMdev] problem trying to write an LLVM register-allocation pass
...n int __overflow (_IO_FILE *, int);
extern wint_t __wunderflow (_IO_FILE *);
extern wint_t __wuflow (_IO_FILE *);
extern wint_t __woverflow (_IO_FILE *, wint_t);
extern int _IO_getc (_IO_FILE *__fp);
extern int _IO_putc (int __c, _IO_FILE *__fp);
extern int _IO_feof (_IO_FILE *__fp) __attribute__ ((__nothrow__));
extern int _IO_ferror (_IO_FILE *__fp) __attribute__ ((__nothrow__));
extern int _IO_peekc_locked (_IO_FILE *__fp);
extern void _IO_flockfile (_IO_FILE *) __attribute__ ((__nothrow__));
extern void _IO_funlockfile (_IO_FILE *) __attribute__ ((__nothrow__));
extern int _IO_ftrylockfile (_IO_FILE...
2017 Mar 20
2
-ffast-math optimizations impacted by symbol renaming in header files
...MATH_ONLY__ macro set to 1. In this case, the Linux header files are redirecting several math functions using the __asm__ extension to rename the symbol. An example of what the header files contains is:
extern double exp (double) __asm__ ("" "__exp_finite") __attribute__ ((__nothrow__ ));
In effect, ‘exp’ gets converted to be ‘__exp_finite’ in the IR. Because some of the optimizations like constant folding or vectorization are looking for the original function name, those optimizations do not get triggered under –ffast-math due to these alternative function names.
Other affec...