The following paired-single functions map directly to a particular MIPS instruction. Please refer to the architecture specification for details on what each instruction does.
v2sf __builtin_mips_pll_ps (v2sf, v2sf)Pair lower lower (pll.ps).
v2sf __builtin_mips_pul_ps (v2sf, v2sf)Pair upper lower (pul.ps).
v2sf __builtin_mips_plu_ps (v2sf, v2sf)Pair lower upper (plu.ps).
v2sf __builtin_mips_puu_ps (v2sf, v2sf)Pair upper upper (puu.ps).
v2sf __builtin_mips_cvt_ps_s (float, float)Convert pair to paired single (cvt.ps.s).
float __builtin_mips_cvt_s_pl (v2sf)Convert pair lower to single (cvt.s.pl).
float __builtin_mips_cvt_s_pu (v2sf)Convert pair upper to single (cvt.s.pu).
v2sf __builtin_mips_abs_ps (v2sf)Absolute value (abs.ps).
v2sf __builtin_mips_alnv_ps (v2sf, v2sf, int)Align variable (alnv.ps).
Note: The value of the third parameter must be 0 or 4 modulo 8, otherwise the result is unpredictable. Please read the instruction description for details.
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.
v2sf __builtin_mips_movt_c_cond_ps (v2sf a, v2sf b, v2sf c, v2sf d)v2sf __builtin_mips_movf_c_cond_ps (v2sf a, v2sf b, v2sf c, v2sf d)Conditional move based on floating-point comparison (c.cond.ps,
movt.ps/movf.ps).
The movt functions return the value x computed by:
c.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_upper_c_cond_ps (v2sf a, v2sf b)int __builtin_mips_lower_c_cond_ps (v2sf a, v2sf b)Comparison of two paired-single values (c.cond.ps,
bc1t/bc1f).
These functions compare a and b using c.cond.ps
and return either the upper or lower half of the result. For example:
v2sf a, b; if (__builtin_mips_upper_c_eq_ps (a, b)) upper_halves_are_equal (); else upper_halves_are_unequal (); if (__builtin_mips_lower_c_eq_ps (a, b)) lower_halves_are_equal (); else lower_halves_are_unequal ();