From acddf6665f067bc98a2529a699b1d4509a7387cb Mon Sep 17 00:00:00 2001 From: Alexandre Oliva Date: Fri, 13 Jan 2023 21:15:41 -0300 Subject: [PR40457] [arm] expand SI-aligned movdi into pair of movsi When expanding a misaligned DImode move, emit aligned SImode moves if the parts are sufficiently aligned. This enables neighboring stores to be peephole-combined into stm, as expected by the PR40457 testcase, even after SLP vectorizes the originally aligned SImode stores into a misaligned DImode store. for gcc/ChangeLog PR target/40457 * config/arm/arm.md (movmisaligndi): Prefer aligned SImode moves. --- gcc/config/arm/arm.md | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) (limited to 'gcc') diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md index 31dfea1..3710c5c 100644 --- a/gcc/config/arm/arm.md +++ b/gcc/config/arm/arm.md @@ -12783,8 +12783,16 @@ rtx hi_op0 = gen_highpart_mode (SImode, DImode, operands[0]); rtx hi_op1 = gen_highpart_mode (SImode, DImode, operands[1]); - emit_insn (gen_movmisalignsi (lo_op0, lo_op1)); - emit_insn (gen_movmisalignsi (hi_op0, hi_op1)); + if (aligned_operand (lo_op0, SImode) && aligned_operand (lo_op1, SImode)) + { + emit_move_insn (lo_op0, lo_op1); + emit_move_insn (hi_op0, hi_op1); + } + else + { + emit_insn (gen_movmisalignsi (lo_op0, lo_op1)); + emit_insn (gen_movmisalignsi (hi_op0, hi_op1)); + } DONE; }) -- cgit v1.1