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Support SSE float environment in fenv.h functions.

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* cpu_features.c: New file.
	* cpu_features.h: New file.
	* crt1.c: Include "cpu_features.h".
	(__mingw_CRTStartup): Call cpu_features_init().
	* Makefile.in (MING_OBJS): Add cpu_features.c.
	(SRCDIST_FILES): Add cpu_features.c, cpu_features.h.
	* include/fenv,h ( fenv_t;): Append  __mxcsr field.
	(__MXCSR_EXCEPT_FLAG_SHIFT): New define.
	(__MXCSR_EXCEPT_MASK_SHIFT): New define.
	(__MXCSR_ROUND_FLAG_SHIFT): New define.
	* mingwex/feclearexcept.c: Include "cpu_features.h".
	Handle SSE environment.
	* mingwex/fegetenv.c: Likewise.
	* mingwex/feholdexcept.c: Likewise.
	* mingwex/fesetenv.c: Likewise.
	* mingwex/fesetexceptflag.c: Likewise.
	* mingwex/fesetround.c: Likewise.
	* mingwex/fetestexcept.c: Likewise.
	* mingwex/feupdateenv.c: Likewise.
	* mingwex/fegetround.c: Add comment.
This commit is contained in:
Danny Smith
2006-07-03 10:32:58 +00:00
parent 69d5f3329f
commit f34428eb35
15 changed files with 252 additions and 17 deletions
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24
winsup/mingw/include/fenv.h
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@ -1,7 +1,6 @@
#ifndef _FENV_H_
#define _FENV_H_
/* FPU status word exception flags */
#define FE_INVALID 0x01
#define FE_DENORMAL 0x02
@ -18,6 +17,18 @@
#define FE_UPWARD 0x0800
#define FE_TOWARDZERO 0x0c00
/* The MXCSR exception flags are the same as the
FE flags. */
#define __MXCSR_EXCEPT_FLAG_SHIFT 0
/* How much to shift FE status word exception flags
to get the MXCSR exeptions masks, */
#define __MXCSR_EXCEPT_MASK_SHIFT 7
/* How much to shift FE control word rounding flags
to get MXCSR rounding flags, */
#define __MXCSR_ROUND_FLAG_SHIFT 3
#ifndef RC_INVOKED
/*
For now, support only for the basic abstraction of flags that are
@ -26,8 +37,10 @@
*/
typedef unsigned short fexcept_t;
/* This 28-byte struct represents the entire floating point
environment as stored by fnstenv or fstenv */
/* This 32-byte struct represents the entire floating point
environment as stored by fnstenv or fstenv, augmented by
the contents of the MXCSR register, as stored by stmxcsr
(if CPU supports it). */
typedef struct
{
unsigned short __control_word;
@ -40,8 +53,9 @@ typedef struct
unsigned short __ip_selector;
unsigned short __opcode;
unsigned int __data_offset;
unsigned short __data_selector;
unsigned short __unused3;
unsigned short __data_selector;
unsigned short __unused3;
unsigned int __mxcsr; /* contents of the MXCSR register */
} fenv_t;