3d0d14f983
lindent these files:
errors lines of code errors/KLOC
arch/x86/math-emu/ 2236 9424 237.2
arch/x86/math-emu/ 128 8706 14.7
no other changes. No code changed:
text data bss dec hex filename
5589802 612739 3833856 10036397 9924ad vmlinux.before
5589802 612739 3833856 10036397 9924ad vmlinux.after
the intent of this patch is to ease the automated tracking of kernel
code quality - it's just much easier for us to maintain it if every file
in arch/x86 is supposed to be clean.
NOTE: it is a known problem of lindent that it causes some style damage
of its own, but it's a safe tool (well, except for the gcc array range
initializers extension), so we did the bulk of the changes via lindent,
and did the manual fixups in a followup patch.
the resulting math-emu code has been tested by Thomas Gleixner on a real
386 DX CPU as well, and it works fine.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/*---------------------------------------------------------------------------+
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| fpu_etc.c |
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| Implement a few FPU instructions. |
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| Copyright (C) 1992,1993,1994,1997 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@suburbia.net |
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+---------------------------------------------------------------------------*/
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#include "fpu_system.h"
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#include "exception.h"
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#include "fpu_emu.h"
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#include "status_w.h"
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#include "reg_constant.h"
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static void fchs(FPU_REG * st0_ptr, u_char st0tag)
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{
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if (st0tag ^ TAG_Empty) {
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signbyte(st0_ptr) ^= SIGN_NEG;
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clear_C1();
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} else
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FPU_stack_underflow();
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}
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static void fabs(FPU_REG * st0_ptr, u_char st0tag)
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{
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if (st0tag ^ TAG_Empty) {
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setpositive(st0_ptr);
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clear_C1();
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} else
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FPU_stack_underflow();
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}
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static void ftst_(FPU_REG * st0_ptr, u_char st0tag)
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{
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switch (st0tag) {
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case TAG_Zero:
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setcc(SW_C3);
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break;
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case TAG_Valid:
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if (getsign(st0_ptr) == SIGN_POS)
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setcc(0);
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else
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setcc(SW_C0);
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break;
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case TAG_Special:
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switch (FPU_Special(st0_ptr)) {
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case TW_Denormal:
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if (getsign(st0_ptr) == SIGN_POS)
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setcc(0);
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else
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setcc(SW_C0);
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if (denormal_operand() < 0) {
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#ifdef PECULIAR_486
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/* This is weird! */
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if (getsign(st0_ptr) == SIGN_POS)
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setcc(SW_C3);
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#endif /* PECULIAR_486 */
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return;
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}
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break;
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case TW_NaN:
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setcc(SW_C0 | SW_C2 | SW_C3); /* Operand is not comparable */
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EXCEPTION(EX_Invalid);
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break;
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case TW_Infinity:
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if (getsign(st0_ptr) == SIGN_POS)
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setcc(0);
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else
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setcc(SW_C0);
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break;
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default:
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setcc(SW_C0 | SW_C2 | SW_C3); /* Operand is not comparable */
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EXCEPTION(EX_INTERNAL | 0x14);
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break;
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}
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break;
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case TAG_Empty:
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setcc(SW_C0 | SW_C2 | SW_C3);
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EXCEPTION(EX_StackUnder);
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break;
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}
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}
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static void fxam(FPU_REG * st0_ptr, u_char st0tag)
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{
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int c = 0;
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switch (st0tag) {
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case TAG_Empty:
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c = SW_C3 | SW_C0;
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break;
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case TAG_Zero:
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c = SW_C3;
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break;
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case TAG_Valid:
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c = SW_C2;
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break;
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case TAG_Special:
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switch (FPU_Special(st0_ptr)) {
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case TW_Denormal:
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c = SW_C2 | SW_C3; /* Denormal */
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break;
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case TW_NaN:
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/* We also use NaN for unsupported types. */
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if ((st0_ptr->sigh & 0x80000000)
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&& (exponent(st0_ptr) == EXP_OVER))
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c = SW_C0;
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break;
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case TW_Infinity:
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c = SW_C2 | SW_C0;
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break;
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}
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}
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if (getsign(st0_ptr) == SIGN_NEG)
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c |= SW_C1;
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setcc(c);
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}
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static FUNC_ST0 const fp_etc_table[] = {
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fchs, fabs, (FUNC_ST0) FPU_illegal, (FUNC_ST0) FPU_illegal,
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ftst_, fxam, (FUNC_ST0) FPU_illegal, (FUNC_ST0) FPU_illegal
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};
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void FPU_etc(void)
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{
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(fp_etc_table[FPU_rm]) (&st(0), FPU_gettag0());
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}
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