diff options
Diffstat (limited to 'bin86-0.3/bccfp/fpushi.x')
| -rw-r--r-- | bin86-0.3/bccfp/fpushi.x | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/bin86-0.3/bccfp/fpushi.x b/bin86-0.3/bccfp/fpushi.x deleted file mode 100644 index b19aae2..0000000 --- a/bin86-0.3/bccfp/fpushi.x +++ /dev/null @@ -1,126 +0,0 @@ -! bcc 386 floating point routines (version 2) -! -- Fpushi, Fpushl, Fpushs, Fpushc, Fpushuc, Fpushui, Fpushul, Fpushus -! authors: Timothy Murphy (tim@maths.tcd.ie), Bruce Evans - -#include "fplib.h" - -! Convert the short in ax to double and push on stack - - .globl Fpushs - .align ALIGNMENT -Fpushs: - cwde - add eax,#0 ! fast 3-byte instruction to align - -! Convert the int or long in eax to double and push on stack - - .globl Fpushi - .globl Fpushl -! .align ALIGNMENT ! don't do this until it pads with nop's -Fpushi: -Fpushl: - test eax,eax - jz return_eax ! got 0 in eax - mov ebx,#(D_EXP_BIAS+D_NORM_BIT) << D_EXP_SHIFT ! set no-sign and exponent - jns normalize ! sign and fraction bits already set up - mov ebx,#D_SIGN_MASK | ((D_EXP_BIAS+D_NORM_BIT) << D_EXP_SHIFT) ! adjust sign - neg eax ! adjust fraction - jmp normalize - - .align ALIGNMENT -ret1: - mov eax,#D_EXP_BIAS << D_EXP_SHIFT - add eax,#0 ! fast 3-byte instruction to align - -! .align ALIGNMENT ! don't do this until it pads with nop's -return_eax: - pop ecx - push eax ! upper dword - push dword #0 ! lower dword = 0 - jmp ecx ! return - -! Convert the (unsigned) char in al to double and push on stack - - .globl Fpushc - .globl Fpushuc - .align ALIGNMENT -Fpushc: -Fpushuc: - and eax,#(1 << CHAR_BIT)-1 - add eax,#0 ! fast 3-byte instruction to align - -! Convert the unsigned short in ax to double and push on stack - - .globl Fpushus -! .align ALIGNMENT ! don't do this until it pads with nop's -Fpushus: - and eax,#(1 << SHORT_BIT)-1 - add eax,#0 ! fast 3-byte instruction to align - -! Convert the unsigned int or long in eax to double and push on stack - - .globl Fpushui - .globl Fpushul -! .align ALIGNMENT ! don't do this until it pads with nop's -Fpushui: -Fpushul: - cmp eax,#1 ! this tests for both 0 and 1 - jb return_eax ! got 0 in eax - jz ret1 - mov ebx,#(D_EXP_BIAS+D_NORM_BIT) << D_EXP_SHIFT ! set no-sign and exponent - -! .align ALIGNMENT ! don't do this until it pads with nop's -normalize: - sub edx,edx ! clear lower dword of result - -! Find first nonzero bit -! Don't use bsr, it is slow (const + 3n on 386, const + n on 486) - - sub ecx,ecx ! prepare unsigned extension of cl - test eax,#~D_FRAC_MASK - jnz large - test eax,#0xFF << (D_NORM_BIT-8) - jnz middle - shl eax,#8 - sub ebx,#8 << D_EXP_SHIFT - test eax,#0xFF << (D_NORM_BIT-8) - jnz middle - shl eax,#8 - sub ebx,#8 << D_EXP_SHIFT -middle: - shld ecx,eax,#D_NORM_BIT - mov cl,bsr_table[ecx] - add ecx,#REG_BIT-D_NORM_BIT-D_NORM_BIT - neg ecx - shl eax,cl - shl ecx,#D_EXP_SHIFT - sub ebx,ecx -return: - and eax,#D_FRAC_MASK ! remove normalization bit - or eax,ebx ! include exponent (and sign) to fraction - pop ecx - push eax ! upper dword - push edx ! lower dword - jmp ecx ! return - - .align ALIGNMENT -large: - shld ecx,eax,#REG_BIT-(D_NORM_BIT+8) - jnz huge - shld ecx,eax,#REG_BIT-D_NORM_BIT - mov cl,bsr_table[ecx] -got_shift_right: - shrd edx,eax,cl - shr eax,cl - shl ecx,#D_EXP_SHIFT - add ebx,ecx - jmp return - - .align ALIGNMENT -huge: - mov cl,bsr_table[ecx] - add cl,#8 - jmp got_shift_right - - .data - .extern bsr_table |