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

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#### 6.59.15.3 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.s` or `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.ps` and 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.ps` or `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.ps` to compare a with b and to compare c with d. The `any` forms return true if any of the four results are true and 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 ();

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