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[alpha] adjust MEM alignment for block move [PR115459]

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Before issuing loads or stores for a block move, adjust the MEM
alignments if analysis of the addresses enabled the inference of
stricter alignment.  This ensures that the MEMs are sufficiently
aligned for the corresponding insns, which avoids trouble in case of
e.g. substitutions into SUBREGs.


for  gcc/ChangeLog

	PR target/115459
	* config/alpha/alpha.cc (alpha_expand_block_move): Adjust
	MEMs to match inferred alignment.
This commit is contained in:
Alexandre Oliva 2024-07-12 05:42:07 -03:00 • committed by Alexandre Oliva
parent c6f38e5e6d
commit ccfe715180
1 changed files with 12 additions and 0 deletions
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12
gcc/config/alpha/alpha.cc
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@ -3820,6 +3820,12 @@ alpha_expand_block_move (rtx operands[])
else if (a >= 16 && c % 2 == 0) else if (a >= 16 && c % 2 == 0)
src_align = 16; src_align = 16;
} }
if (MEM_P (orig_src) && MEM_ALIGN (orig_src) < src_align)
{
orig_src = shallow_copy_rtx (orig_src);
set_mem_align (orig_src, src_align);
}
} }
tmp = XEXP (orig_dst, 0); tmp = XEXP (orig_dst, 0);
@ -3841,6 +3847,12 @@ alpha_expand_block_move (rtx operands[])
else if (a >= 16 && c % 2 == 0) else if (a >= 16 && c % 2 == 0)
dst_align = 16; dst_align = 16;
} }
if (MEM_P (orig_dst) && MEM_ALIGN (orig_dst) < dst_align)
{
orig_dst = shallow_copy_rtx (orig_dst);
set_mem_align (orig_dst, dst_align);
}
} }
ofs = 0; ofs = 0;