procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

[PATCH v2] sh: libgcc: Implement fenv rouding and exceptions for soft-fp [PR118257]

Browse source 
Implement fenv rouding and exceptions for soft-fp, as per SuperH
arch specification.

No new tests required, as it's already covered by many torture tests
with fenv_exceptions.

	PR target/118257

libgcc/ChangeLog:

	* config/sh/sfp-machine.h (_FPU_GETCW): Implement with builtin.
	(_FPU_SETCW): Likewise.
	(FP_EX_ENABLE_SHIFT): Derive from arch spec.
	(FP_EX_CAUSE_SHIFT): Likewise.
	(FP_RND_MASK): Likewise.
	(FP_EX_INVALID): Likewise.
	(FP_EX_DIVZERO): Likewise.
	(FP_EX_ALL): Likewise.
	(FP_EX_OVERFLOW): Likewise.
	(FP_EX_UNDERFLOW): Likewise.
	(FP_EX_INEXACT): Likewise.
	(_FP_DECL_EX): Declear default FCSR value.
	(FP_RND_NEAREST): Derive from arch spec.
	(FP_RND_ZERO): Likewise.
	(FP_INIT_ROUNDMODE): Likewise.
	(FP_ROUNDMODE): Likewise.
	(FP_TRAPPING_EXCEPTIONS): Likewise.
	(FP_HANDLE_EXCEPTIONS): Implement with _FPU_SETCW.
This commit is contained in:
Jiaxun Yang 2025-04-19 08:12:07 -06:00 • committed by Jeff Law
parent 2a643f55f5
commit 05c4e3ecb5
1 changed files with 46 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

46
libgcc/config/sh/sfp-machine.h
View file

@ -76,6 +76,52 @@ typedef int __gcc_CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
R##_c = FP_CLS_NAN; \
} while (0)
#ifdef __SH_FPU_ANY__
#define _FPU_GETCW(fpscr) fpscr = __builtin_sh_get_fpscr ()
#define _FPU_SETCW(fpscr) __builtin_sh_set_fpscr (fpscr)
#define FP_EX_ENABLE_SHIFT 5
#define FP_EX_CAUSE_SHIFT 10
#define FP_EX_INVALID 0x0040
#define FP_EX_DIVZERO 0x0020
#if defined (__SH2E__)
#define FP_EX_ALL (FP_EX_DIVZERO | FP_EX_INVALID)
#else
#define FP_EX_OVERFLOW 0x0010
#define FP_EX_UNDERFLOW 0x0008
#define FP_EX_INEXACT 0x0004
#define FP_EX_ALL (FP_EX_DIVZERO | FP_EX_INEXACT | \
FP_EX_INVALID | FP_EX_OVERFLOW | FP_EX_UNDERFLOW)
#endif
#define _FP_DECL_EX \
unsigned int _fcsr __attribute__ ((unused)) = FP_RND_NEAREST
/* Rounding modes. */
#define FP_RND_NEAREST 0x0
#define FP_RND_ZERO 0x1
/* Placeholder, hardware does not have PINF/MINF modes. */
#define FP_RND_PINF 0x2
#define FP_RND_MINF 0x3
#define FP_RND_MASK 3
#define FP_INIT_ROUNDMODE _FPU_GETCW (_fcsr)
#define FP_ROUNDMODE (_fcsr & FP_RND_MASK)
#define FP_TRAPPING_EXCEPTIONS ((_fcsr >> FP_EX_ENABLE_SHIFT) & FP_EX_ALL)
#define FP_HANDLE_EXCEPTIONS \
do { \
_fcsr &= ~(FP_EX_ALL << FP_EX_CAUSE_SHIFT); \
_fcsr |= _fex | (_fex << FP_EX_CAUSE_SHIFT); \
_FPU_SETCW (_fcsr); \
} while (0)
#else
#define FP_EX_INVALID (1 << 4)
#define FP_EX_DIVZERO (1 << 3)
#if !defined (__SH2E__)
#define FP_EX_OVERFLOW (1 << 2)
#define FP_EX_UNDERFLOW (1 << 1)
#define FP_EX_INEXACT (1 << 0)
#endif
#endif
#define _FP_TININESS_AFTER_ROUNDING 1
#define __LITTLE_ENDIAN 1234