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[AArch64,PATCH] Adjust preferred_reload_class of SP+C 

Co-Authored-By: Marcus Shawcroft <marcus.shawcroft@arm.com>

From-SVN: r204018
This commit is contained in:
Ian Bolton 2013-10-24 14:31:45 +00:00 committed by Marcus Shawcroft
parent ac63f3057f
commit 27bd251b64
2 changed files with 24 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2013-10-17 Ian Bolton <ian.bolton@arm.com>
Marcus Shawcroft <marcus.shawcroft@arm.com>
* config/aarch64/aarch64.c (aarch64_preferred_reload_class):
Special case reload SP+C into none GENERAL_REGS.
2013-10-24 Michael Matz <matz@suse.de>
* gengtype.c (is_file_equal): Check that files will be same

18
gcc/config/aarch64/aarch64.c
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@ -4263,6 +4263,24 @@ aarch64_preferred_reload_class (rtx x, reg_class_t regclass)
&& !aarch64_simd_imm_scalar_p (x, GET_MODE (x)))
return NO_REGS;
/* Register eliminiation can result in a request for
SP+constant->FP_REGS. We cannot support such operations which
use SP as source and an FP_REG as destination, so reject out
right now. */
if (! reg_class_subset_p (regclass, GENERAL_REGS) && GET_CODE (x) == PLUS)
{
rtx lhs = XEXP (x, 0);
/* Look through a possible SUBREG introduced by ILP32. */
if (GET_CODE (lhs) == SUBREG)
lhs = SUBREG_REG (lhs);
gcc_assert (REG_P (lhs));
gcc_assert (reg_class_subset_p (REGNO_REG_CLASS (REGNO (lhs)),
POINTER_REGS));
return NO_REGS;
}
return regclass;
}