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sim: Add partial support for IEEE 754-2008
2022-02-01 Faraz Shahbazker <fshahbazker@wavecomp.com> sim/common/ChangeLog: * sim-fpu.c (sim_fpu_minmax_nan): New. (sim_fpu_max): Add variant behaviour for IEEE 754-2008. (sim_fpu_min): Likewise. (sim_fpu_is_un, sim_fpu_is_or): New. (sim_fpu_un, sim_fpu_or): New. (sim_fpu_is_ieee754_2008, sim_fpu_is_ieee754_1985): New. (sim_fpu_set_mode): New. (sim_fpu_classify): New. * sim-fpu.h (sim_fpu_minmax_nan): New declaration. (sim_fpu_un, sim_fpu_or): New declarations. (sim_fpu_is_un, sim_fpu_is_or): New declarations. (sim_fpu_mode): New enum. [sim_fpu_state](current_mode): New field. (sim_fpu_current_mode): New define. (sim_fpu_is_ieee754_2008): New declaration. (sim_fpu_is_ieee754_1985): New declaration. (sim_fpu_set_mode): New declaration. (sim_fpu_classify): New declaration.
This commit is contained in:
Faraz Shahbazker
committed by
Mike Frysinger
Mike Frysinger
parent
b6af5f3a74
commit
fc3c199fac
@ -1005,6 +1005,30 @@ sim_fpu_op_nan (sim_fpu *f, const sim_fpu *l, const sim_fpu *r)
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return 0;
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}
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/* NaN handling specific to min/max operations. */
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INLINE_SIM_FPU (int)
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sim_fpu_minmax_nan (sim_fpu *f, const sim_fpu *l, const sim_fpu *r)
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{
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if (sim_fpu_is_snan (l)
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|| sim_fpu_is_snan (r)
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|| sim_fpu_is_ieee754_1985 ())
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return sim_fpu_op_nan (f, l, r);
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else
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/* if sim_fpu_is_ieee754_2008()
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&& ((sim_fpu_is_qnan (l) || sim_fpu_is_qnan (r))) */
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{
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/* In IEEE754-2008:
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"minNum/maxNum is ... the canonicalized number if one
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operand is a number and the other a quiet NaN." */
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if (sim_fpu_is_qnan (l))
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*f = *r;
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else /* if (sim_fpu_is_qnan (r)) */
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*f = *l;
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return 0;
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}
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}
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/* Arithmetic ops */
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INLINE_SIM_FPU (int)
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@ -1553,7 +1577,7 @@ sim_fpu_max (sim_fpu *f,
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const sim_fpu *r)
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{
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if (sim_fpu_is_nan (l) || sim_fpu_is_nan (r))
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return sim_fpu_op_nan (f, l, r);
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return sim_fpu_minmax_nan (f, l, r);
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if (sim_fpu_is_infinity (l))
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{
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if (sim_fpu_is_infinity (r)
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@ -1616,7 +1640,7 @@ sim_fpu_min (sim_fpu *f,
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const sim_fpu *r)
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{
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if (sim_fpu_is_nan (l) || sim_fpu_is_nan (r))
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return sim_fpu_op_nan (f, l, r);
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return sim_fpu_minmax_nan (f, l, r);
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if (sim_fpu_is_infinity (l))
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{
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if (sim_fpu_is_infinity (r)
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@ -1677,7 +1701,7 @@ INLINE_SIM_FPU (int)
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sim_fpu_neg (sim_fpu *f,
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const sim_fpu *r)
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{
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if (sim_fpu_is_snan (r))
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if (sim_fpu_is_ieee754_1985 () && sim_fpu_is_snan (r))
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{
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*f = *r;
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f->class = sim_fpu_class_qnan;
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@ -1700,7 +1724,7 @@ sim_fpu_abs (sim_fpu *f,
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{
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*f = *r;
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f->sign = 0;
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if (sim_fpu_is_snan (r))
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if (sim_fpu_is_ieee754_1985 () && sim_fpu_is_snan (r))
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{
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f->class = sim_fpu_class_qnan;
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return sim_fpu_status_invalid_snan;
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@ -2255,6 +2279,21 @@ sim_fpu_is_gt (const sim_fpu *l, const sim_fpu *r)
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return is;
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}
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INLINE_SIM_FPU (int)
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sim_fpu_is_un (const sim_fpu *l, const sim_fpu *r)
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{
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int is;
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sim_fpu_un (&is, l, r);
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return is;
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}
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INLINE_SIM_FPU (int)
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sim_fpu_is_or (const sim_fpu *l, const sim_fpu *r)
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{
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int is;
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sim_fpu_or (&is, l, r);
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return is;
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}
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/* Compare operators */
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@ -2378,12 +2417,57 @@ sim_fpu_gt (int *is,
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return sim_fpu_lt (is, r, l);
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}
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INLINE_SIM_FPU (int)
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sim_fpu_un (int *is, const sim_fpu *l, const sim_fpu *r)
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{
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if (sim_fpu_is_nan (l) || sim_fpu_is_nan (r))
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{
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*is = 1;
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return 0;
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}
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*is = 0;
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return 0;
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}
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INLINE_SIM_FPU (int)
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sim_fpu_or (int *is, const sim_fpu *l, const sim_fpu *r)
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{
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sim_fpu_un (is, l, r);
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/* Invert result. */
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*is = !*is;
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return 0;
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}
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INLINE_SIM_FPU(int)
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sim_fpu_classify (const sim_fpu *f)
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{
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switch (f->class)
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{
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case sim_fpu_class_snan: return SIM_FPU_IS_SNAN;
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case sim_fpu_class_qnan: return SIM_FPU_IS_QNAN;
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case sim_fpu_class_infinity:
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return f->sign ? SIM_FPU_IS_NINF : SIM_FPU_IS_PINF;
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case sim_fpu_class_zero:
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return f->sign ? SIM_FPU_IS_NZERO : SIM_FPU_IS_PZERO;
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case sim_fpu_class_number:
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return f->sign ? SIM_FPU_IS_NNUMBER : SIM_FPU_IS_PNUMBER;
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case sim_fpu_class_denorm:
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return f->sign ? SIM_FPU_IS_NDENORM : SIM_FPU_IS_PDENORM;
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default:
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fprintf (stderr, "Bad switch\n");
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abort ();
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}
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return 0;
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}
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/* A number of useful constants */
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#if EXTERN_SIM_FPU_P
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sim_fpu_state _sim_fpu = {
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.quiet_nan_inverted = false,
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.current_mode = sim_fpu_ieee754_1985,
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};
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const sim_fpu sim_fpu_zero = {
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@ -2406,6 +2490,24 @@ const sim_fpu sim_fpu_max64 = {
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};
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#endif
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/* Specification swapping behaviour */
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INLINE_SIM_FPU (bool)
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sim_fpu_is_ieee754_1985 (void)
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{
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return (sim_fpu_current_mode == sim_fpu_ieee754_1985);
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}
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INLINE_SIM_FPU (bool)
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sim_fpu_is_ieee754_2008 (void)
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{
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return (sim_fpu_current_mode == sim_fpu_ieee754_2008);
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}
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INLINE_SIM_FPU (void)
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sim_fpu_set_mode (const sim_fpu_mode m)
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{
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sim_fpu_current_mode = m;
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}
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/* For debugging */
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@ -163,8 +163,15 @@ typedef enum
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FIXME: This state is global, but should be moved to SIM_CPU. */
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typedef enum
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{
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sim_fpu_ieee754_1985,
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sim_fpu_ieee754_2008,
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} sim_fpu_mode;
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typedef struct _sim_fpu_state {
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bool quiet_nan_inverted; /* Toggle quiet NaN semantics. */
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sim_fpu_mode current_mode;
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} sim_fpu_state;
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@ -268,6 +275,8 @@ INLINE_SIM_FPU (int) sim_fpu_sqrt (sim_fpu *f,
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INLINE_SIM_FPU (int) sim_fpu_op_nan (sim_fpu *f,
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const sim_fpu *l, const sim_fpu *r);
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INLINE_SIM_FPU (int) sim_fpu_minmax_nan (sim_fpu *f,
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const sim_fpu *l, const sim_fpu *r);
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@ -318,7 +327,8 @@ INLINE_SIM_FPU (double) sim_fpu_2d (const sim_fpu *d);
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/* INLINE_SIM_FPU (void) sim_fpu_f2 (sim_fpu *f, float s); */
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INLINE_SIM_FPU (void) sim_fpu_d2 (sim_fpu *f, double d);
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/* IEEE754-2008 classifiction function. */
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INLINE_SIM_FPU (int) sim_fpu_classify (const sim_fpu *f);
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/* Specific number classes.
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@ -367,7 +377,20 @@ INLINE_SIM_FPU (int) sim_fpu_is_ne (const sim_fpu *l, const sim_fpu *r);
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INLINE_SIM_FPU (int) sim_fpu_is_ge (const sim_fpu *l, const sim_fpu *r);
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INLINE_SIM_FPU (int) sim_fpu_is_gt (const sim_fpu *l, const sim_fpu *r);
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/* Unordered/ordered comparison operators. */
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INLINE_SIM_FPU (int) sim_fpu_un (int *is, const sim_fpu *l, const sim_fpu *r);
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INLINE_SIM_FPU (int) sim_fpu_or (int *is, const sim_fpu *l, const sim_fpu *r);
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INLINE_SIM_FPU (int) sim_fpu_is_un (const sim_fpu *l, const sim_fpu *r);
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INLINE_SIM_FPU (int) sim_fpu_is_or (const sim_fpu *l, const sim_fpu *r);
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/* Changes the behaviour of the library to IEEE754-2008 or IEEE754-1985.
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The default for the library is IEEE754-1985. */
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INLINE_SIM_FPU (bool) sim_fpu_is_ieee754_1985 (void);
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INLINE_SIM_FPU (bool) sim_fpu_is_ieee754_2008 (void);
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INLINE_SIM_FPU (void) sim_fpu_set_mode (const sim_fpu_mode m);
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/* General number class and comparison operators.
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@ -411,6 +434,7 @@ extern sim_fpu_state _sim_fpu;
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between pre-R6 and R6 MIPS cores. */
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#define sim_fpu_quiet_nan_inverted _sim_fpu.quiet_nan_inverted
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#define sim_fpu_current_mode _sim_fpu.current_mode
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/* A number of useful constants. */
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