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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 11:16:31 +0200
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 11:16:31 +0200
commitda957e111bb0c189a4a3bf8a00caaecb59ed94ca (patch)
tree6916075fdd3e28869dcd3dfa2cf160a74d1cb02e /arch/i386/math-emu/reg_mul.c
parent2ec1df4130c60d1eb49dc0fa0ed15858fede6b05 (diff)
i386: move math-emu
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/i386/math-emu/reg_mul.c')
-rw-r--r--arch/i386/math-emu/reg_mul.c132
1 files changed, 0 insertions, 132 deletions
diff --git a/arch/i386/math-emu/reg_mul.c b/arch/i386/math-emu/reg_mul.c
deleted file mode 100644
index 40f50b61bc6..00000000000
--- a/arch/i386/math-emu/reg_mul.c
+++ /dev/null
@@ -1,132 +0,0 @@
-/*---------------------------------------------------------------------------+
- | reg_mul.c |
- | |
- | Multiply one FPU_REG by another, put the result in a destination FPU_REG. |
- | |
- | Copyright (C) 1992,1993,1997 |
- | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
- | E-mail billm@suburbia.net |
- | |
- | Returns the tag of the result if no exceptions or errors occurred. |
- | |
- +---------------------------------------------------------------------------*/
-
-/*---------------------------------------------------------------------------+
- | The destination may be any FPU_REG, including one of the source FPU_REGs. |
- +---------------------------------------------------------------------------*/
-
-#include "fpu_emu.h"
-#include "exception.h"
-#include "reg_constant.h"
-#include "fpu_system.h"
-
-
-/*
- Multiply two registers to give a register result.
- The sources are st(deststnr) and (b,tagb,signb).
- The destination is st(deststnr).
- */
-/* This routine must be called with non-empty source registers */
-int FPU_mul(FPU_REG const *b, u_char tagb, int deststnr, int control_w)
-{
- FPU_REG *a = &st(deststnr);
- FPU_REG *dest = a;
- u_char taga = FPU_gettagi(deststnr);
- u_char saved_sign = getsign(dest);
- u_char sign = (getsign(a) ^ getsign(b));
- int tag;
-
-
- if ( !(taga | tagb) )
- {
- /* Both regs Valid, this should be the most common case. */
-
- tag = FPU_u_mul(a, b, dest, control_w, sign, exponent(a) + exponent(b));
- if ( tag < 0 )
- {
- setsign(dest, saved_sign);
- return tag;
- }
- FPU_settagi(deststnr, tag);
- return tag;
- }
-
- if ( taga == TAG_Special )
- taga = FPU_Special(a);
- if ( tagb == TAG_Special )
- tagb = FPU_Special(b);
-
- if ( ((taga == TAG_Valid) && (tagb == TW_Denormal))
- || ((taga == TW_Denormal) && (tagb == TAG_Valid))
- || ((taga == TW_Denormal) && (tagb == TW_Denormal)) )
- {
- FPU_REG x, y;
- if ( denormal_operand() < 0 )
- return FPU_Exception;
-
- FPU_to_exp16(a, &x);
- FPU_to_exp16(b, &y);
- tag = FPU_u_mul(&x, &y, dest, control_w, sign,
- exponent16(&x) + exponent16(&y));
- if ( tag < 0 )
- {
- setsign(dest, saved_sign);
- return tag;
- }
- FPU_settagi(deststnr, tag);
- return tag;
- }
- else if ( (taga <= TW_Denormal) && (tagb <= TW_Denormal) )
- {
- if ( ((tagb == TW_Denormal) || (taga == TW_Denormal))
- && (denormal_operand() < 0) )
- return FPU_Exception;
-
- /* Must have either both arguments == zero, or
- one valid and the other zero.
- The result is therefore zero. */
- FPU_copy_to_regi(&CONST_Z, TAG_Zero, deststnr);
- /* The 80486 book says that the answer is +0, but a real
- 80486 behaves this way.
- IEEE-754 apparently says it should be this way. */
- setsign(dest, sign);
- return TAG_Zero;
- }
- /* Must have infinities, NaNs, etc */
- else if ( (taga == TW_NaN) || (tagb == TW_NaN) )
- {
- return real_2op_NaN(b, tagb, deststnr, &st(0));
- }
- else if ( ((taga == TW_Infinity) && (tagb == TAG_Zero))
- || ((tagb == TW_Infinity) && (taga == TAG_Zero)) )
- {
- return arith_invalid(deststnr); /* Zero*Infinity is invalid */
- }
- else if ( ((taga == TW_Denormal) || (tagb == TW_Denormal))
- && (denormal_operand() < 0) )
- {
- return FPU_Exception;
- }
- else if (taga == TW_Infinity)
- {
- FPU_copy_to_regi(a, TAG_Special, deststnr);
- setsign(dest, sign);
- return TAG_Special;
- }
- else if (tagb == TW_Infinity)
- {
- FPU_copy_to_regi(b, TAG_Special, deststnr);
- setsign(dest, sign);
- return TAG_Special;
- }
-
-#ifdef PARANOID
- else
- {
- EXCEPTION(EX_INTERNAL|0x102);
- return FPU_Exception;
- }
-#endif /* PARANOID */
-
- return 0;
-}