MIPS-3D Built-in Functions (Using the GNU Compiler Collection (GCC)) (original) (raw)

7.13.18.3 MIPS-3D Built-in Functions ¶

The MIPS-3D Application-Specific Extension (ASE) includes additional paired-single instructions that are designed to improve the performance of 3D graphics operations. Support for these instructions is controlled by the -mips3d command-line option.

The functions listed below map directly to a particular MIPS-3D instruction. Please refer to the architecture specification for more details on what each instruction does.

v2sf __builtin_mips_addr_ps (v2sf, v2sf)

Reduction add (addr.ps).

v2sf __builtin_mips_mulr_ps (v2sf, v2sf)

Reduction multiply (mulr.ps).

v2sf __builtin_mips_cvt_pw_ps (v2sf)

Convert paired single to paired word (cvt.pw.ps).

v2sf __builtin_mips_cvt_ps_pw (v2sf)

Convert paired word to paired single (cvt.ps.pw).

float __builtin_mips_recip1_s (float)

double __builtin_mips_recip1_d (double)

v2sf __builtin_mips_recip1_ps (v2sf)

Reduced-precision reciprocal (sequence step 1) (recip1.fmt).

float __builtin_mips_recip2_s (float, float)

double __builtin_mips_recip2_d (double, double)

v2sf __builtin_mips_recip2_ps (v2sf, v2sf)

Reduced-precision reciprocal (sequence step 2) (recip2.fmt).

float __builtin_mips_rsqrt1_s (float)

double __builtin_mips_rsqrt1_d (double)

v2sf __builtin_mips_rsqrt1_ps (v2sf)

Reduced-precision reciprocal square root (sequence step 1) (rsqrt1.fmt).

float __builtin_mips_rsqrt2_s (float, float)

double __builtin_mips_rsqrt2_d (double, double)

v2sf __builtin_mips_rsqrt2_ps (v2sf, v2sf)

Reduced-precision reciprocal square root (sequence step 2) (rsqrt2.fmt).

The following multi-instruction functions are also available. In each case, cond can be any of the 16 floating-point conditions:f, un, eq, ueq, olt, ult,ole, ule, sf, ngle, seq,ngl, lt, nge, le or ngt.

int __builtin_mips_cabs_cond_s (float a, float b)

int __builtin_mips_cabs_cond_d (double a, double b)

Absolute comparison of two scalar values (cabs.cond.fmt,bc1t/bc1f).

These functions compare a and b using cabs.cond.sor cabs.cond.d and return the result as a boolean value. For example:

float a, b; if (__builtin_mips_cabs_eq_s (a, b)) true (); else false ();

int __builtin_mips_upper_cabs_cond_ps (v2sf a, v2sf b)

int __builtin_mips_lower_cabs_cond_ps (v2sf a, v2sf b)

Absolute comparison of two paired-single values (cabs.cond.ps,bc1t/bc1f).

These functions compare a and b using cabs.cond.psand return either the upper or lower half of the result. For example:

v2sf a, b; if (__builtin_mips_upper_cabs_eq_ps (a, b)) upper_halves_are_equal (); else upper_halves_are_unequal ();

if (__builtin_mips_lower_cabs_eq_ps (a, b)) lower_halves_are_equal (); else lower_halves_are_unequal ();

v2sf __builtin_mips_movt_cabs_cond_ps (v2sf a, v2sf b, v2sf c, v2sf d)

v2sf __builtin_mips_movf_cabs_cond_ps (v2sf a, v2sf b, v2sf c, v2sf d)

Conditional move based on absolute comparison (cabs.cond.ps,movt.ps/movf.ps).

The movt functions return the value x computed by:

cabs.cond.ps cc,a,b mov.ps x,c movt.ps x,d,cc

The movf functions are similar but use movf.ps instead of movt.ps.

int __builtin_mips_any_c_cond_ps (v2sf a, v2sf b)

int __builtin_mips_all_c_cond_ps (v2sf a, v2sf b)

int __builtin_mips_any_cabs_cond_ps (v2sf a, v2sf b)

int __builtin_mips_all_cabs_cond_ps (v2sf a, v2sf b)

Comparison of two paired-single values (c.cond.ps/cabs.cond.ps,bc1any2t/bc1any2f).

These functions compare a and b using c.cond.psor cabs.cond.ps. The any forms return true if either result is true and the all forms return true if both results are true. For example:

v2sf a, b; if (__builtin_mips_any_c_eq_ps (a, b)) one_is_true (); else both_are_false ();

if (__builtin_mips_all_c_eq_ps (a, b)) both_are_true (); else one_is_false ();

int __builtin_mips_any_c_cond_4s (v2sf a, v2sf b, v2sf c, v2sf d)

int __builtin_mips_all_c_cond_4s (v2sf a, v2sf b, v2sf c, v2sf d)

int __builtin_mips_any_cabs_cond_4s (v2sf a, v2sf b, v2sf c, v2sf d)

int __builtin_mips_all_cabs_cond_4s (v2sf a, v2sf b, v2sf c, v2sf d)

Comparison of four paired-single values (c.cond.ps/cabs.cond.ps,bc1any4t/bc1any4f).

These functions use c.cond.ps or cabs.cond.psto compare a with b and to compare c with d. The any forms return true if any of the four results are trueand the all forms return true if all four results are true. For example:

v2sf a, b, c, d; if (__builtin_mips_any_c_eq_4s (a, b, c, d)) some_are_true (); else all_are_false ();

if (__builtin_mips_all_c_eq_4s (a, b, c, d)) all_are_true (); else some_are_false ();