mirror of
https://github.com/reactos/reactos.git
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Fix _control87, the old implementation was terribly wrong and broken.
svn path=/trunk/; revision=11607
This commit is contained in:
Gregor Anich
parent
9e12bbeae6
commit
d5b047feae
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@ -2,19 +2,149 @@
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#include <msvcrt/float.h>
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#define X87_CW_IM (1<<0) /* Invalid operation mask */
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#define X87_CW_DM (1<<1) /* Denormal operand mask */
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#define X87_CW_ZM (1<<2) /* Zero divide mask */
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#define X87_CW_OM (1<<3) /* Overflow mask */
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#define X87_CW_UM (1<<4) /* Underflow mask */
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#define X87_CW_PM (1<<5) /* Precision mask */
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#define X87_CW_PC_MASK (3<<8) /* precision control mask */
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#define X87_CW_PC24 (0<<8) /* 24 bit precision */
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#define X87_CW_PC53 (2<<8) /* 53 bit precision */
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#define X87_CW_PC64 (3<<8) /* 64 bit precision */
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#define X87_CW_RC_MASK (3<<10) /* rounding control mask */
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#define X87_CW_RC_NEAREST (0<<10) /* round to nearest */
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#define X87_CW_RC_DOWN (1<<10) /* round down */
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#define X87_CW_RC_UP (2<<10) /* round up */
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#define X87_CW_RC_ZERO (3<<10) /* round toward zero (chop) */
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#define X87_CW_IC (1<<12) /* infinity control flag */
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/*
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* @implemented
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*/
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unsigned int _controlfp (unsigned int unNew, unsigned int unMask)
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{
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return _control87(unNew,unMask);
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unsigned int _controlfp(unsigned int unNew, unsigned int unMask)
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{
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return _control87(unNew,unMask);
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}
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/*
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* @implemented
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*/
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unsigned int _control87 (unsigned int unNew, unsigned int unMask)
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{
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unsigned int _control87(unsigned int unNew, unsigned int unMask)
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{
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unsigned int FpuCw;
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unsigned int DummyCw = 0;
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/* get the controlword */
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asm volatile("fstcw %0\n\t" : "=m"(FpuCw));
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FpuCw &= 0x0000ffff;
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/* translate it into _control87 format */
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if (FpuCw & X87_CW_IM)
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DummyCw |= _EM_INVALID;
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if (FpuCw & X87_CW_DM)
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DummyCw |= _EM_DENORMAL;
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if (FpuCw & X87_CW_ZM)
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DummyCw |= _EM_ZERODIVIDE;
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if (FpuCw & X87_CW_OM)
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DummyCw |= _EM_OVERFLOW;
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if (FpuCw & X87_CW_UM)
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DummyCw |= _EM_UNDERFLOW;
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if (FpuCw & X87_CW_PM)
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DummyCw |= _EM_INEXACT;
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switch (FpuCw & X87_CW_PC_MASK)
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{
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case X87_CW_PC24:
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DummyCw |= _PC_24;
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break;
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case X87_CW_PC53:
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DummyCw |= _PC_53;
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break;
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case X87_CW_PC64:
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DummyCw |= _PC_64;
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break;
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}
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switch (FpuCw & X87_CW_RC_MASK)
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{
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case X87_CW_RC_NEAREST:
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DummyCw |= _RC_NEAR;
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break;
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case X87_CW_RC_DOWN:
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DummyCw |= _RC_DOWN;
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break;
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case X87_CW_RC_UP:
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DummyCw |= _RC_UP;
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break;
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case X87_CW_RC_ZERO:
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DummyCw |= _RC_CHOP;
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break;
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}
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/* unset (un)masked bits */
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DummyCw &= ~unMask;
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unNew &= unMask;
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/* set new bits */
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DummyCw |= unNew;
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/* translate back into x87 format
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* FIXME: translate infinity control!
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*/
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FpuCw = 0;
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if (DummyCw & _EM_INVALID)
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FpuCw |= X87_CW_IM;
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if (DummyCw & _EM_DENORMAL)
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FpuCw |= X87_CW_DM;
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if (DummyCw & _EM_ZERODIVIDE)
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FpuCw |= X87_CW_ZM;
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if (DummyCw & _EM_OVERFLOW)
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FpuCw |= X87_CW_OM;
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if (DummyCw & _EM_UNDERFLOW)
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FpuCw |= X87_CW_UM;
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if (DummyCw & _EM_INEXACT)
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FpuCw |= X87_CW_PM;
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switch (DummyCw & _MCW_PC)
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{
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case _PC_24:
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FpuCw |= X87_CW_PC24;
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break;
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case _PC_53:
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FpuCw |= X87_CW_PC53;
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break;
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case _PC_64:
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default:
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FpuCw |= X87_CW_PC64;
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break;
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}
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switch (DummyCw & _MCW_RC)
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{
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case _RC_NEAR:
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FpuCw |= X87_CW_RC_NEAREST;
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break;
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case _RC_DOWN:
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FpuCw |= X87_CW_RC_DOWN;
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break;
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case _RC_UP:
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FpuCw |= X87_CW_RC_UP;
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break;
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case _RC_CHOP:
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FpuCw |= X87_CW_RC_ZERO;
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break;
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}
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/* set controlword */
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asm volatile("fldcw %0" : : "m"(FpuCw));
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return DummyCw;
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#if 0 /* The follwing is the original code, broken I think! -blight */
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register unsigned int __res;
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#ifdef __GNUC__
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__asm__ __volatile__ (
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@ -36,8 +166,9 @@ __asm__ __volatile__ (
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"fldcw (%%esp) \n\t"
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"popl %%edx \n\t"
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:"=r" (__res):"r" (unNew),"r" (unMask): "ax", "dx", "cx");
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:"=a" (__res):"r" (unNew),"r" (unMask): "dx", "cx");
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#else
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#endif /*__GNUC__*/
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return __res;
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#endif
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}
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@ -2,6 +2,26 @@
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#include <msvcrt/float.h>
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#define X87_CW_IM (1<<0) /* Invalid operation mask */
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#define X87_CW_DM (1<<1) /* Denormal operand mask */
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#define X87_CW_ZM (1<<2) /* Zero divide mask */
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#define X87_CW_OM (1<<3) /* Overflow mask */
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#define X87_CW_UM (1<<4) /* Underflow mask */
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#define X87_CW_PM (1<<5) /* Precision mask */
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#define X87_CW_PC_MASK (3<<8) /* precision control mask */
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#define X87_CW_PC24 (0<<8) /* 24 bit precision */
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#define X87_CW_PC53 (2<<8) /* 53 bit precision */
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#define X87_CW_PC64 (3<<8) /* 64 bit precision */
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#define X87_CW_RC_MASK (3<<10) /* rounding control mask */
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#define X87_CW_RC_NEAREST (0<<10) /* round to nearest */
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#define X87_CW_RC_DOWN (1<<10) /* round down */
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#define X87_CW_RC_UP (2<<10) /* round up */
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#define X87_CW_RC_ZERO (3<<10) /* round toward zero (chop) */
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#define X87_CW_IC (1<<12) /* infinity control flag */
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/*
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* @implemented
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*/
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@ -15,6 +35,116 @@ unsigned int _controlfp(unsigned int unNew, unsigned int unMask)
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*/
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unsigned int _control87(unsigned int unNew, unsigned int unMask)
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{
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unsigned int FpuCw;
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unsigned int DummyCw = 0;
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/* get the controlword */
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asm volatile("fstcw %0\n\t" : "=m"(FpuCw));
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FpuCw &= 0x0000ffff;
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/* translate it into _control87 format */
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if (FpuCw & X87_CW_IM)
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DummyCw |= _EM_INVALID;
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if (FpuCw & X87_CW_DM)
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DummyCw |= _EM_DENORMAL;
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if (FpuCw & X87_CW_ZM)
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DummyCw |= _EM_ZERODIVIDE;
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if (FpuCw & X87_CW_OM)
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DummyCw |= _EM_OVERFLOW;
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if (FpuCw & X87_CW_UM)
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DummyCw |= _EM_UNDERFLOW;
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if (FpuCw & X87_CW_PM)
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DummyCw |= _EM_INEXACT;
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switch (FpuCw & X87_CW_PC_MASK)
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{
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case X87_CW_PC24:
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DummyCw |= _PC_24;
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break;
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case X87_CW_PC53:
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DummyCw |= _PC_53;
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break;
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case X87_CW_PC64:
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DummyCw |= _PC_64;
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break;
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}
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switch (FpuCw & X87_CW_RC_MASK)
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{
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case X87_CW_RC_NEAREST:
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DummyCw |= _RC_NEAR;
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break;
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case X87_CW_RC_DOWN:
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DummyCw |= _RC_DOWN;
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break;
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case X87_CW_RC_UP:
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DummyCw |= _RC_UP;
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break;
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case X87_CW_RC_ZERO:
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DummyCw |= _RC_CHOP;
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break;
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}
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/* unset (un)masked bits */
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DummyCw &= ~unMask;
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unNew &= unMask;
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/* set new bits */
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DummyCw |= unNew;
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/* translate back into x87 format
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* FIXME: translate infinity control!
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*/
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FpuCw = 0;
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if (DummyCw & _EM_INVALID)
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FpuCw |= X87_CW_IM;
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if (DummyCw & _EM_DENORMAL)
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FpuCw |= X87_CW_DM;
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if (DummyCw & _EM_ZERODIVIDE)
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FpuCw |= X87_CW_ZM;
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if (DummyCw & _EM_OVERFLOW)
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FpuCw |= X87_CW_OM;
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if (DummyCw & _EM_UNDERFLOW)
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FpuCw |= X87_CW_UM;
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if (DummyCw & _EM_INEXACT)
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FpuCw |= X87_CW_PM;
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switch (DummyCw & _MCW_PC)
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{
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case _PC_24:
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FpuCw |= X87_CW_PC24;
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break;
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case _PC_53:
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FpuCw |= X87_CW_PC53;
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break;
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case _PC_64:
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default:
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FpuCw |= X87_CW_PC64;
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break;
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}
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switch (DummyCw & _MCW_RC)
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{
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case _RC_NEAR:
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FpuCw |= X87_CW_RC_NEAREST;
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break;
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case _RC_DOWN:
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FpuCw |= X87_CW_RC_DOWN;
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break;
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case _RC_UP:
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FpuCw |= X87_CW_RC_UP;
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break;
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case _RC_CHOP:
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FpuCw |= X87_CW_RC_ZERO;
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break;
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}
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/* set controlword */
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asm volatile("fldcw %0" : : "m"(FpuCw));
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return DummyCw;
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#if 0 /* The follwing is the original code, broken I think! -blight */
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register unsigned int __res;
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#ifdef __GNUC__
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__asm__ __volatile__ (
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@ -36,8 +166,9 @@ __asm__ __volatile__ (
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"fldcw (%%esp) \n\t"
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"popl %%edx \n\t"
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:"=r" (__res):"r" (unNew),"r" (unMask): "ax", "dx", "cx");
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:"=a" (__res):"r" (unNew),"r" (unMask): "dx", "cx");
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#else
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#endif /*__GNUC__*/
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return __res;
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#endif
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}
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