diff options
Diffstat (limited to 'arch/i386/math-emu/reg_constant.c')
| -rw-r--r-- | arch/i386/math-emu/reg_constant.c | 51 |
1 files changed, 30 insertions, 21 deletions
diff --git a/arch/i386/math-emu/reg_constant.c b/arch/i386/math-emu/reg_constant.c index c1981ce24..1b2458eea 100644 --- a/arch/i386/math-emu/reg_constant.c +++ b/arch/i386/math-emu/reg_constant.c @@ -3,9 +3,9 @@ | | | All of the constant FPU_REGs | | | - | Copyright (C) 1992,1993,1994 | - | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | - | Australia. E-mail billm@vaxc.cc.monash.edu.au | + | Copyright (C) 1992,1993,1994,1996 | + | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | + | Australia. E-mail billm@jacobi.maths.monash.edu.au | | | | | +---------------------------------------------------------------------------*/ @@ -14,6 +14,7 @@ #include "fpu_emu.h" #include "status_w.h" #include "reg_constant.h" +#include "control_w.h" FPU_REG const CONST_1 = { SIGN_POS, TW_Valid, EXP_BIAS, @@ -56,7 +57,7 @@ FPU_REG const CONST_INF = { SIGN_POS, TW_Infinity, EXP_OVER, 0x00000000, 0x8000 -static void fld_const(FPU_REG const *c) +static void fld_const(FPU_REG const *c, int adj) { FPU_REG *st_new_ptr; @@ -67,50 +68,58 @@ static void fld_const(FPU_REG const *c) } push(); reg_move(c, st_new_ptr); + st_new_ptr->sigl += adj; /* For all our fldxxx constants, we don't need to + borrow or carry. */ clear_C1(); } +/* A fast way to find out whether x is one of RC_DOWN or RC_CHOP + (and not one of RC_RND or RC_UP). + */ +#define DOWN_OR_CHOP(x) (x & RC_DOWN) -static void fld1(void) +static void fld1(int rc) { - fld_const(&CONST_1); + fld_const(&CONST_1, 0); } -static void fldl2t(void) +static void fldl2t(int rc) { - fld_const(&CONST_L2T); + fld_const(&CONST_L2T, (rc == RC_UP) ? 1 : 0); } -static void fldl2e(void) +static void fldl2e(int rc) { - fld_const(&CONST_L2E); + fld_const(&CONST_L2E, DOWN_OR_CHOP(rc) ? -1 : 0); } -static void fldpi(void) +static void fldpi(int rc) { - fld_const(&CONST_PI); + fld_const(&CONST_PI, DOWN_OR_CHOP(rc) ? -1 : 0); } -static void fldlg2(void) +static void fldlg2(int rc) { - fld_const(&CONST_LG2); + fld_const(&CONST_LG2, DOWN_OR_CHOP(rc) ? -1 : 0); } -static void fldln2(void) +static void fldln2(int rc) { - fld_const(&CONST_LN2); + fld_const(&CONST_LN2, DOWN_OR_CHOP(rc) ? -1 : 0); } -static void fldz(void) +static void fldz(int rc) { - fld_const(&CONST_Z); + fld_const(&CONST_Z, 0); } -static FUNC constants_table[] = { - fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, FPU_illegal +typedef void (*FUNC_RC)(int); + +static FUNC_RC constants_table[] = { + fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, (FUNC_RC)FPU_illegal }; void fconst(void) { - (constants_table[FPU_rm])(); + (constants_table[FPU_rm])(control_word & CW_RC); } |