i386: Use generic division to generate INEXACT exception
Introduce math_force_eval_div to use generic division to generate INEXACT as well as INVALID and DIVZERO exceptions. libgcc/ChangeLog: * config/i386/sfp-exceptions.c (__math_force_eval): Remove. (__math_force_eval_div): New define. (__sfp_handle_exceptions): Use __math_force_eval_div to use generic division to generate INVALID, DIVZERO and INEXACT exceptions. libatomic/ChangeLog: * config/x86/fenv.c (__math_force_eval): Remove. (__math_force_eval_div): New define. (__atomic_deraiseexcept): Use __math_force_eval_div to use generic division to generate INVALID, DIVZERO and INEXACT exceptions. libgfortran/ChangeLog: * config/fpu-387.h (__math_force_eval): Remove. (__math_force_eval_div): New define. (local_feraiseexcept): Use __math_force_eval_div to use generic division to generate INVALID, DIVZERO and INEXACT exceptions. (struct fenv): Define named struct instead of typedef.
This commit is contained in:
Uros Bizjak
parent
bc95e478fe
commit
d3a1459cd4
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@ -1,7 +1,15 @@
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2020-05-06 Uroš Bizjak <ubizjak@gmail.com>
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* config/x86/fenv.c (__math_force_eval): Remove.
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(__math_force_eval_div): New define.
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(__atomic_deraiseexcept): Use __math_force_eval_div to use
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generic division to generate INVALID, DIVZERO and INEXACT
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exceptions.
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2020-05-01 Uroš Bizjak <ubizjak@gmail.com>
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* config/x86/fenv.c (__math_force_eval): New define.
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(__atomic_feraiseexcept): Use __math_force_eval to evaluete
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(__atomic_feraiseexcept): Use __math_force_eval to evaluate
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generic division to generate INVALID and DIVZERO exceptions.
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2020-04-19 Uroš Bizjak <ubizjak@gmail.com>
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@ -48,9 +48,11 @@ struct fenv
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};
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#ifdef __SSE_MATH__
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# define __math_force_eval(x) asm volatile ("" : : "x" (x));
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# define __math_force_eval_div(x, y) \
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do { asm ("" : "+x" (x)); asm volatile ("" : : "x" (x / y)); } while (0)
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#else
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# define __math_force_eval(x) asm volatile ("" : : "f" (x));
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# define __math_force_eval_div(x, y) \
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do { asm ("" : "+t" (x)); asm volatile ("" : : "f" (x / y)); } while (0)
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#endif
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/* Raise the supported floating-point exceptions from EXCEPTS. Other
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@ -59,14 +61,15 @@ struct fenv
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void
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__atomic_feraiseexcept (int excepts)
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{
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struct fenv temp;
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if (excepts & FE_INVALID)
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{
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float f = 0.0f;
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__math_force_eval (f / f);
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__math_force_eval_div (f, f);
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}
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if (excepts & FE_DENORM)
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{
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struct fenv temp;
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asm volatile ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= FE_DENORM;
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asm volatile ("fldenv\t%0" : : "m" (temp));
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@ -75,11 +78,10 @@ __atomic_feraiseexcept (int excepts)
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if (excepts & FE_DIVBYZERO)
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{
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float f = 1.0f, g = 0.0f;
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__math_force_eval (f / g);
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__math_force_eval_div (f, g);
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}
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if (excepts & FE_OVERFLOW)
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{
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struct fenv temp;
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asm volatile ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= FE_OVERFLOW;
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asm volatile ("fldenv\t%0" : : "m" (temp));
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@ -87,7 +89,6 @@ __atomic_feraiseexcept (int excepts)
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}
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if (excepts & FE_UNDERFLOW)
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{
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struct fenv temp;
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asm volatile ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= FE_UNDERFLOW;
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asm volatile ("fldenv\t%0" : : "m" (temp));
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@ -96,11 +97,6 @@ __atomic_feraiseexcept (int excepts)
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if (excepts & FE_INEXACT)
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{
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float f = 1.0f, g = 3.0f;
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#ifdef __SSE_MATH__
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asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
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#else
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asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
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/* No need for fwait, exception is triggered by emitted fstp. */
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#endif
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__math_force_eval_div (f, g);
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}
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}
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@ -1,3 +1,11 @@
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2020-05-06 Uroš Bizjak <ubizjak@gmail.com>
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* config/i386/sfp-exceptions.c (__math_force_eval): Remove.
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(__math_force_eval_div): New define.
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(__sfp_handle_exceptions): Use __math_force_eval_div to use
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generic division to generate INVALID, DIVZERO and INEXACT
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exceptions.
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2020-05-06 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
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* config/aarch64/lse-init.c (init_have_lse_atomics): Use __getauxval
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@ -54,7 +62,7 @@
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2020-05-01 Uroš Bizjak <ubizjak@gmail.com>
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* config/i386/sfp-exceptions.c (__math_force_eval): New define.
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(__sfp_handle_exceptions): Use __math_force_eval to evaluete
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(__sfp_handle_exceptions): Use __math_force_eval to evaluate
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generic division to generate INVALID and DIVZERO exceptions.
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2020-04-27 Sebastian Huber <sebastian.huber@embedded-brains.de>
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@ -42,22 +42,25 @@ struct fenv
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};
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#ifdef __SSE_MATH__
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# define __math_force_eval(x) asm volatile ("" : : "x" (x));
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# define __math_force_eval_div(x, y) \
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do { asm ("" : "+x" (x)); asm volatile ("" : : "x" (x / y)); } while (0)
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#else
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# define __math_force_eval(x) asm volatile ("" : : "f" (x));
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# define __math_force_eval_div(x, y) \
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do { asm ("" : "+t" (x)); asm volatile ("" : : "f" (x / y)); } while (0)
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#endif
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void
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__sfp_handle_exceptions (int _fex)
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{
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struct fenv temp;
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if (_fex & FP_EX_INVALID)
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{
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float f = 0.0f;
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__math_force_eval (f / f);
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__math_force_eval_div (f, f);
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}
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if (_fex & FP_EX_DENORM)
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{
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struct fenv temp;
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asm volatile ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= FP_EX_DENORM;
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asm volatile ("fldenv\t%0" : : "m" (temp));
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@ -66,11 +69,10 @@ __sfp_handle_exceptions (int _fex)
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if (_fex & FP_EX_DIVZERO)
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{
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float f = 1.0f, g = 0.0f;
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__math_force_eval (f / g);
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__math_force_eval_div (f, g);
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}
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if (_fex & FP_EX_OVERFLOW)
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{
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struct fenv temp;
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asm volatile ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= FP_EX_OVERFLOW;
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asm volatile ("fldenv\t%0" : : "m" (temp));
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@ -78,7 +80,6 @@ __sfp_handle_exceptions (int _fex)
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}
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if (_fex & FP_EX_UNDERFLOW)
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{
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struct fenv temp;
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asm volatile ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= FP_EX_UNDERFLOW;
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asm volatile ("fldenv\t%0" : : "m" (temp));
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@ -87,12 +88,7 @@ __sfp_handle_exceptions (int _fex)
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if (_fex & FP_EX_INEXACT)
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{
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float f = 1.0f, g = 3.0f;
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#ifdef __SSE_MATH__
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asm volatile ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
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#else
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asm volatile ("fdivs\t%1" : "+t" (f) : "m" (g));
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/* No need for fwait, exception is triggered by emitted fstp. */
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#endif
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__math_force_eval_div (f, g);
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}
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}
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#endif
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@ -1,7 +1,16 @@
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2020-05-06 Uroš Bizjak <ubizjak@gmail.com>
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* config/fpu-387.h (__math_force_eval): Remove.
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(__math_force_eval_div): New define.
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(local_feraiseexcept): Use __math_force_eval_div to use
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generic division to generate INVALID, DIVZERO and INEXACT
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exceptions.
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(struct fenv): Define named struct instead of typedef.
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2020-05-01 Uroš Bizjak <ubizjak@gmail.com>
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* config/fpu-387.h (__math_force_eval): New define.
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(local_feraiseexcept): Use __math_force_eval to evaluete
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(local_feraiseexcept): Use __math_force_eval to evaluate
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generic division to generate INVALID and DIVZERO exceptions.
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2020-04-22 Fritz Reese <foreese@gcc.gnu.org>
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@ -69,7 +69,7 @@ has_sse (void)
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/* This structure corresponds to the layout of the block
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written by FSTENV. */
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typedef struct
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struct fenv
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{
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unsigned short int __control_word;
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unsigned short int __unused1;
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@ -79,22 +79,28 @@ typedef struct
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unsigned short int __unused3;
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unsigned int __eip;
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unsigned short int __cs_selector;
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unsigned short int __opcode;
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unsigned int __opcode:11;
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unsigned int __unused4:5;
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unsigned int __data_offset;
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unsigned short int __data_selector;
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unsigned short int __unused5;
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unsigned int __mxcsr;
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}
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my_fenv_t;
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};
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/* Check we can actually store the FPU state in the allocated size. */
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_Static_assert (sizeof(my_fenv_t) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE,
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_Static_assert (sizeof(struct fenv) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE,
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"GFC_FPE_STATE_BUFFER_SIZE is too small");
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#ifdef __SSE_MATH__
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# define __math_force_eval(x) __asm__ __volatile__ ("" : : "x" (x));
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# define __math_force_eval_div(x, y) \
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do { \
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__asm__ ("" : "+x" (x)); __asm__ __volatile__ ("" : : "x" (x / y)); \
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} while (0)
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#else
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# define __math_force_eval(x) __asm__ __volatile__ ("" : : "f" (x));
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# define __math_force_eval_div(x, y) \
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do { \
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__asm__ ("" : "+t" (x)); __asm__ __volatile__ ("" : : "f" (x / y)); \
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} while (0)
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#endif
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/* Raise the supported floating-point exceptions from EXCEPTS. Other
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@ -104,14 +110,15 @@ _Static_assert (sizeof(my_fenv_t) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE,
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static void
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local_feraiseexcept (int excepts)
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{
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struct fenv temp;
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if (excepts & _FPU_MASK_IM)
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{
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float f = 0.0f;
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__math_force_eval (f / f);
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__math_force_eval_div (f, f);
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}
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if (excepts & _FPU_MASK_DM)
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{
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my_fenv_t temp;
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__asm__ __volatile__ ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= _FPU_MASK_DM;
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__asm__ __volatile__ ("fldenv\t%0" : : "m" (temp));
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@ -120,11 +127,10 @@ local_feraiseexcept (int excepts)
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if (excepts & _FPU_MASK_ZM)
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{
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float f = 1.0f, g = 0.0f;
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__math_force_eval (f / g);
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__math_force_eval_div (f, g);
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}
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if (excepts & _FPU_MASK_OM)
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{
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my_fenv_t temp;
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__asm__ __volatile__ ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= _FPU_MASK_OM;
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__asm__ __volatile__ ("fldenv\t%0" : : "m" (temp));
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@ -132,7 +138,6 @@ local_feraiseexcept (int excepts)
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}
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if (excepts & _FPU_MASK_UM)
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{
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my_fenv_t temp;
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__asm__ __volatile__ ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= _FPU_MASK_UM;
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__asm__ __volatile__ ("fldenv\t%0" : : "m" (temp));
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@ -141,12 +146,7 @@ local_feraiseexcept (int excepts)
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if (excepts & _FPU_MASK_PM)
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{
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float f = 1.0f, g = 3.0f;
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#ifdef __SSE_MATH__
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__asm__ __volatile__ ("%vdivss\t{%1, %d0|%d0, %1}" : "+x" (f) : "xm" (g));
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#else
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__asm__ __volatile__ ("fdivs\t%1" : "+t" (f) : "m" (g));
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/* No need for fwait, exception is triggered by emitted fstp. */
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#endif
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__math_force_eval_div (f, g);
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}
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}
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@ -272,7 +272,7 @@ get_fpu_except_flags (void)
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void
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set_fpu_except_flags (int set, int clear)
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{
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my_fenv_t temp;
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struct fenv temp;
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int exc_set = 0, exc_clr = 0;
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/* Translate from GFC_PE_* values to _FPU_MASK_* values. */
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@ -426,7 +426,7 @@ support_fpu_rounding_mode (int mode __attribute__((unused)))
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void
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get_fpu_state (void *state)
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{
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my_fenv_t *envp = state;
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struct fenv *envp = state;
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__asm__ __volatile__ ("fnstenv\t%0" : "=m" (*envp));
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@ -441,7 +441,7 @@ get_fpu_state (void *state)
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void
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set_fpu_state (void *state)
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{
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my_fenv_t *envp = state;
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struct fenv *envp = state;
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/* glibc sources (sysdeps/x86_64/fpu/fesetenv.c) do something more
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complex than this, but I think it suffices in our case. */
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