From 777a80af43eebb7506937cf04b54f17c4fce2b8e Mon Sep 17 00:00:00 2001 From: Max Filippov Date: Tue, 7 Jun 2022 21:01:01 -0700 Subject: [PATCH] gcc: xtensa: fix PR target/105879 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. (cherry picked from commit e94c6dbfb57a862dd8a8685eabc4886ad1aaea25) --- 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 3b61e5d..2554235 100644 --- a/gcc/config/xtensa/xtensa.md +++ b/gcc/config/xtensa/xtensa.md @@ -754,11 +754,14 @@ 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; } -- 2.7.4