diff options
Diffstat (limited to 'arch/x86/math-emu/fpu_etc.c')
| -rw-r--r-- | arch/x86/math-emu/fpu_etc.c | 193 |
1 files changed, 90 insertions, 103 deletions
diff --git a/arch/x86/math-emu/fpu_etc.c b/arch/x86/math-emu/fpu_etc.c index e3b5d465587f..e73631e0cde9 100644 --- a/arch/x86/math-emu/fpu_etc.c +++ b/arch/x86/math-emu/fpu_etc.c @@ -16,128 +16,115 @@ #include "status_w.h" #include "reg_constant.h" - -static void fchs(FPU_REG *st0_ptr, u_char st0tag) +static void fchs(FPU_REG * st0_ptr, u_char st0tag) { - if ( st0tag ^ TAG_Empty ) - { - signbyte(st0_ptr) ^= SIGN_NEG; - clear_C1(); - } - else - FPU_stack_underflow(); + if (st0tag ^ TAG_Empty) { + signbyte(st0_ptr) ^= SIGN_NEG; + clear_C1(); + } else + FPU_stack_underflow(); } - -static void fabs(FPU_REG *st0_ptr, u_char st0tag) +static void fabs(FPU_REG * st0_ptr, u_char st0tag) { - if ( st0tag ^ TAG_Empty ) - { - setpositive(st0_ptr); - clear_C1(); - } - else - FPU_stack_underflow(); + if (st0tag ^ TAG_Empty) { + setpositive(st0_ptr); + clear_C1(); + } else + FPU_stack_underflow(); } - -static void ftst_(FPU_REG *st0_ptr, u_char st0tag) +static void ftst_(FPU_REG * st0_ptr, u_char st0tag) { - switch (st0tag) - { - case TAG_Zero: - setcc(SW_C3); - break; - case TAG_Valid: - if (getsign(st0_ptr) == SIGN_POS) - setcc(0); - else - setcc(SW_C0); - break; - case TAG_Special: - switch ( FPU_Special(st0_ptr) ) - { - case TW_Denormal: - if (getsign(st0_ptr) == SIGN_POS) - setcc(0); - else - setcc(SW_C0); - if ( denormal_operand() < 0 ) - { -#ifdef PECULIAR_486 - /* This is weird! */ - if (getsign(st0_ptr) == SIGN_POS) + switch (st0tag) { + case TAG_Zero: setcc(SW_C3); + break; + case TAG_Valid: + if (getsign(st0_ptr) == SIGN_POS) + setcc(0); + else + setcc(SW_C0); + break; + case TAG_Special: + switch (FPU_Special(st0_ptr)) { + case TW_Denormal: + if (getsign(st0_ptr) == SIGN_POS) + setcc(0); + else + setcc(SW_C0); + if (denormal_operand() < 0) { +#ifdef PECULIAR_486 + /* This is weird! */ + if (getsign(st0_ptr) == SIGN_POS) + setcc(SW_C3); #endif /* PECULIAR_486 */ - return; - } - break; - case TW_NaN: - setcc(SW_C0|SW_C2|SW_C3); /* Operand is not comparable */ - EXCEPTION(EX_Invalid); - break; - case TW_Infinity: - if (getsign(st0_ptr) == SIGN_POS) - setcc(0); - else - setcc(SW_C0); - break; - default: - setcc(SW_C0|SW_C2|SW_C3); /* Operand is not comparable */ - EXCEPTION(EX_INTERNAL|0x14); - break; + return; + } + break; + case TW_NaN: + setcc(SW_C0 | SW_C2 | SW_C3); /* Operand is not comparable */ + EXCEPTION(EX_Invalid); + break; + case TW_Infinity: + if (getsign(st0_ptr) == SIGN_POS) + setcc(0); + else + setcc(SW_C0); + break; + default: + setcc(SW_C0 | SW_C2 | SW_C3); /* Operand is not comparable */ + EXCEPTION(EX_INTERNAL | 0x14); + break; + } + break; + case TAG_Empty: + setcc(SW_C0 | SW_C2 | SW_C3); + EXCEPTION(EX_StackUnder); + break; } - break; - case TAG_Empty: - setcc(SW_C0|SW_C2|SW_C3); - EXCEPTION(EX_StackUnder); - break; - } } - -static void fxam(FPU_REG *st0_ptr, u_char st0tag) +static void fxam(FPU_REG * st0_ptr, u_char st0tag) { - int c = 0; - switch (st0tag) - { - case TAG_Empty: - c = SW_C3|SW_C0; - break; - case TAG_Zero: - c = SW_C3; - break; - case TAG_Valid: - c = SW_C2; - break; - case TAG_Special: - switch ( FPU_Special(st0_ptr) ) - { - case TW_Denormal: - c = SW_C2|SW_C3; /* Denormal */ - break; - case TW_NaN: - /* We also use NaN for unsupported types. */ - if ( (st0_ptr->sigh & 0x80000000) && (exponent(st0_ptr) == EXP_OVER) ) - c = SW_C0; - break; - case TW_Infinity: - c = SW_C2|SW_C0; - break; + int c = 0; + switch (st0tag) { + case TAG_Empty: + c = SW_C3 | SW_C0; + break; + case TAG_Zero: + c = SW_C3; + break; + case TAG_Valid: + c = SW_C2; + break; + case TAG_Special: + switch (FPU_Special(st0_ptr)) { + case TW_Denormal: + c = SW_C2 | SW_C3; /* Denormal */ + break; + case TW_NaN: + /* We also use NaN for unsupported types. */ + if ((st0_ptr->sigh & 0x80000000) + && (exponent(st0_ptr) == EXP_OVER)) + c = SW_C0; + break; + case TW_Infinity: + c = SW_C2 | SW_C0; + break; + } } - } - if ( getsign(st0_ptr) == SIGN_NEG ) - c |= SW_C1; - setcc(c); + if (getsign(st0_ptr) == SIGN_NEG) + c |= SW_C1; + setcc(c); } - static FUNC_ST0 const fp_etc_table[] = { - fchs, fabs, (FUNC_ST0)FPU_illegal, (FUNC_ST0)FPU_illegal, - ftst_, fxam, (FUNC_ST0)FPU_illegal, (FUNC_ST0)FPU_illegal + fchs, fabs, (FUNC_ST0) FPU_illegal, (FUNC_ST0) FPU_illegal, + ftst_, fxam, (FUNC_ST0) FPU_illegal, (FUNC_ST0) FPU_illegal }; void FPU_etc(void) { - (fp_etc_table[FPU_rm])(&st(0), FPU_gettag0()); + (fp_etc_table[FPU_rm]) (&st(0), FPU_gettag0()); } |
