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AArch64: aarch64_class_max_nregs mishandles 64-bit structure modes [PR112577]

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The target hook aarch64_class_max_nregs returns the incorrect result for 64-bit
structure modes like V31DImode or V41DFmode etc.  The calculation of the nregs
is based on the size of AdvSIMD vector register for 64-bit modes which ought to
be UNITS_PER_VREG / 2.  This patch fixes the register size.

gcc/ChangeLog:

	PR target/112577
	* config/aarch64/aarch64.cc (aarch64_class_max_nregs): Handle 64-bit
	vector structure modes correctly.
This commit is contained in:
Tejas Belagod 2024-01-11 12:37:06 +05:30
parent c5f48b5fdd
commit ca04e7a2e1
1 changed files with 2 additions and 0 deletions
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2
gcc/config/aarch64/aarch64.cc
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@ -12961,6 +12961,8 @@ aarch64_class_max_nregs (reg_class_t regclass, machine_mode mode)
&& constant_multiple_p (GET_MODE_SIZE (mode),
aarch64_vl_bytes (mode, vec_flags), &nregs))
return nregs;
if (vec_flags == (VEC_ADVSIMD | VEC_STRUCT | VEC_PARTIAL))
return GET_MODE_SIZE (mode).to_constant () / 8;
return (vec_flags & VEC_ADVSIMD
? CEIL (lowest_size, UNITS_PER_VREG)
: CEIL (lowest_size, UNITS_PER_WORD));