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arm: partial revert of r11-8168 [PR100067]

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This is a partial revert of r11-8168.  The overall purpose of the
commit is retained (to fix a bogus warning when -mfpu=<not-auto> is
used in combination with eg -mcpu=neoverse-v1), but it removes the
hunk that changed the subsequent feature bits for features of a
simd/fp unit that cannot be described by -mfpu.  While I still think
that is the correct direction of travel, it's somewhat disruptive and
not appropriate for late stage4.  I'll revisit for gcc-12.

gcc:
	PR target/100067
	* config/arm/arm.c (arm_configure_build_target): Do not strip
	extended FPU/SIMD feature bits from the target ISA when -mfpu
	is specified (partial revert of r11-8168).
This commit is contained in:
Richard Earnshaw 2021-04-19 16:56:31 +01:00
parent 714bdc31b6
commit 3bffc4b37e
1 changed files with 5 additions and 3 deletions
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8
gcc/config/arm/arm.c
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@ -3396,9 +3396,11 @@ arm_configure_build_target (struct arm_build_target *target,
auto_sbitmap fpu_bits (isa_num_bits);
arm_initialize_isa (fpu_bits, arm_selected_fpu->isa_bits);
/* Clear out ALL bits relating to the FPU/simd extensions, to avoid
potentially invalid combinations later on that we can't match. */
bitmap_and_compl (target->isa, target->isa, isa_all_fpbits);
/* This should clear out ALL bits relating to the FPU/simd
extensions, to avoid potentially invalid combinations later on
that we can't match. At present we only clear out those bits
that can be set by -mfpu. This should be fixed in GCC-12. */
bitmap_and_compl (target->isa, target->isa, isa_all_fpubits_internal);
bitmap_ior (target->isa, target->isa, fpu_bits);
}