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gcc: xtensa: fix PR target/105879

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split_double operates with the 'word that comes first in memory in the
target' terminology, while gen_lowpart operates with the 'value
representing some low-order bits of X' terminology. They are not
equivalent and must be dealt with differently on little- and big-endian
targets.

gcc/
	PR target/105879
	* config/xtensa/xtensa.md (movdi): Rename 'first' and 'second'
	to 'lowpart' and 'highpart' so that they match 'gen_lowpart' and
	'gen_highpart' bitwise semantics and fix order of highpart and
	lowpart depending on target endianness.
This commit is contained in:
Max Filippov 2022-06-07 21:01:01 -07:00
parent 90a6c3b6d6
commit e94c6dbfb5
1 changed files with 7 additions and 4 deletions
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11
gcc/config/xtensa/xtensa.md
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@ -799,11 +799,14 @@
because of offering further optimization opportunities. */
if (register_operand (operands[0], DImode))
{
rtx first, second;
rtx lowpart, highpart;
split_double (operands[1], &first, &second);
emit_insn (gen_movsi (gen_lowpart (SImode, operands[0]), first));
emit_insn (gen_movsi (gen_highpart (SImode, operands[0]), second));
if (TARGET_BIG_ENDIAN)
split_double (operands[1], &highpart, &lowpart);
else
split_double (operands[1], &lowpart, &highpart);
emit_insn (gen_movsi (gen_lowpart (SImode, operands[0]), lowpart));
emit_insn (gen_movsi (gen_highpart (SImode, operands[0]), highpart));
DONE;
}