aarch64: Tweak FMAX/FMIN iterators

There was some duplication between the maxmin_uns (uns for unspec
rather than unsigned) int attribute and the optab int attribute.
The difficulty for FMAXNM and FMINNM is that the instructions
really correspond to two things: the smax/smin optabs for floats
(used only for fast-math-like flags) and the fmax/fmin optabs
(used for built-in functions).  The optab attribute was
consistently for the former but maxmin_uns had a mixture of both.

This patch renames maxmin_uns to fmaxmin and only uses it
for the fmax and fmin optabs.  The reductions that previously
used the maxmin_uns attribute now use the optab attribute instead.

FMAX and FMIN are awkward in that they don't correspond to any
optab.  It's nevertheless useful to define them alongside the
“real” optabs.  Previously they were known as “smax_nan” and
“smin_nan”, but the problem with those names it that smax and
smin are only used for floats if NaNs don't matter.  This patch
therefore uses fmax_nan and fmin_nan instead.

There is still some inconsistency, in that the optab attribute
handles UNSPEC_COND_FMAX but the fmaxmin attribute handles
UNSPEC_FMAX.  This is because the SVE FP instructions, being
predicated, have to use unspecs in cases where the Advanced
SIMD ones could use rtl codes.

At least there are no duplicate entries though, so this seemed
like the best compromise for now.

gcc/
	* config/aarch64/iterators.md (optab): Use fmax_nan instead of
	smax_nan and fmin_nan instead of smin_nan.
	(maxmin_uns): Rename to...
	(fmaxmin): ...this and make the same changes.  Remove entries
	unrelated to fmax* and fmin*.
	* config/aarch64/aarch64.md (<maxmin_uns><mode>3): Rename to...
	(<fmaxmin><mode>3): ...this.
	* config/aarch64/aarch64-simd.md (aarch64_<maxmin_uns>p<mode>):
	Rename to...
	(aarch64_<optab>p<mode>): ...this.
	(<maxmin_uns><mode>3): Rename to...
	(<fmaxmin><mode>3): ...this.
	(reduc_<maxmin_uns>_scal_<mode>): Rename to...
	(reduc_<optab>_scal_<mode>): ...this and update gen* call.
	(aarch64_reduc_<maxmin_uns>_internal<mode>): Rename to...
	(aarch64_reduc_<optab>_internal<mode>): ...this.
	(aarch64_reduc_<maxmin_uns>_internalv2si): Rename to...
	(aarch64_reduc_<optab>_internalv2si): ...this.
	* config/aarch64/aarch64-sve.md (<maxmin_uns><mode>3): Rename to...
	(<fmaxmin><mode>3): ...this.
	* config/aarch64/aarch64-simd-builtins.def (smax_nan, smin_nan)
	Rename to...
	(fmax_nan, fmin_nan): ...this.
	* config/aarch64/arm_neon.h (vmax_f32, vmax_f64, vmaxq_f32, vmaxq_f64)
	(vmin_f32, vmin_f64, vminq_f32, vminq_f64, vmax_f16, vmaxq_f16)
	(vmin_f16, vminq_f16): Update accordingly.

0 files changed, 0 insertions, 0 deletions