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.
---
gcc/config/xtensa/xtensa.md | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
index 6f5cbc541d85..8a119038ba15 100644
--- a/gcc/config/xtensa/xtensa.md
+++ b/gcc/config/xtensa/xtensa.md
@@ -799,11 +799,14 @@
because of offering further optimization opportunities. */
if (register_operand (operands[0], DImode))
{
- rtx first, second;
-
- 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));
+ rtx lowpart, highpart;
+
+ 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;
}
--
2.30.2
