From 0982552bc4eeffb5520deba10dedecfb2390a8de Mon Sep 17 00:00:00 2001 From: Takayuki 'January June' Suwa Date: Wed, 19 Jun 2024 13:59:54 +0900 Subject: [PATCH] xtensa: Eliminate double MEMW insertions for volatile memory This patch makes avoid inserting a MEMW instruction before a load/store nstruction with volatile memory reference if there is already a MEMW immediately before it. gcc/ChangeLog: * config/xtensa/xtensa.cc (print_operand): When outputting MEMW before the instruction, check if the previous instruction is already that. --- gcc/config/xtensa/xtensa.cc | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/gcc/config/xtensa/xtensa.cc b/gcc/config/xtensa/xtensa.cc index bc127997ac6..e2549de5df0 100644 --- a/gcc/config/xtensa/xtensa.cc +++ b/gcc/config/xtensa/xtensa.cc @@ -3078,7 +3078,17 @@ print_operand (FILE *file, rtx x, int letter) /* For a volatile memory reference, emit a MEMW before the load or store. */ if (MEM_VOLATILE_P (x) && TARGET_SERIALIZE_VOLATILE) - fprintf (file, "memw\n\t"); + { + rtx_insn *prev_insn + = prev_nonnote_nondebug_insn (current_output_insn); + rtx pat, src; + + if (! (prev_insn && NONJUMP_INSN_P (prev_insn) + && GET_CODE (pat = PATTERN (prev_insn)) == SET + && GET_CODE (src = SET_SRC (pat)) == UNSPEC + && XINT (src, 1) == UNSPEC_MEMW)) + fprintf (file, "memw\n\t"); + } } else output_operand_lossage ("invalid %%v value"); -- 2.47.2