From 4702d3cf044924970a9a00142542da1edacfd76c Mon Sep 17 00:00:00 2001 From: Richard Earnshaw Date: Fri, 11 Jun 2021 17:18:12 +0100 Subject: [PATCH] arm: Fix general issues with patterns for VLLDM and VLSTM Both lazy_store_multiple_insn and lazy_load_multiple_insn contain invalid RTL (eg they contain a post_inc statement outside of a mem). What's more, the instructions concerned do not modify their input address register. We probably got away with this because they are generated so late in the compilation that no subsequent pass needed to understand them. Nevertheless, this could cause problems someday, so fixed to use a simple legal unspec. gcc: * config/arm/vfp.md (lazy_store_multiple_insn): Rewrite as valid RTL. (lazy_load_multiple_insn): Likewise. --- gcc/config/arm/vfp.md | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/gcc/config/arm/vfp.md b/gcc/config/arm/vfp.md index 93e963696dad..9961f9389fed 100644 --- a/gcc/config/arm/vfp.md +++ b/gcc/config/arm/vfp.md @@ -1703,12 +1703,15 @@ (set_attr "type" "mov_reg")] ) +;; Both this and the next instruction are treated by GCC in the same +;; way as a blockage pattern. That's perhaps stronger than it needs +;; to be, but we do not want accesses to the VFP register bank to be +;; moved across either instruction. + (define_insn "lazy_store_multiple_insn" - [(set (match_operand:SI 0 "s_register_operand" "+&rk") - (post_dec:SI (match_dup 0))) - (unspec_volatile [(const_int 0) - (mem:SI (post_dec:SI (match_dup 0)))] - VUNSPEC_VLSTM)] + [(unspec_volatile + [(mem:BLK (match_operand:SI 0 "s_register_operand" "rk"))] + VUNSPEC_VLSTM)] "use_cmse && reload_completed" "vlstm%?\\t%0" [(set_attr "predicable" "yes") @@ -1716,11 +1719,9 @@ ) (define_insn "lazy_load_multiple_insn" - [(set (match_operand:SI 0 "s_register_operand" "+&rk") - (post_inc:SI (match_dup 0))) - (unspec_volatile:SI [(const_int 0) - (mem:SI (match_dup 0))] - VUNSPEC_VLLDM)] + [(unspec_volatile + [(mem:BLK (match_operand:SI 0 "s_register_operand" "rk"))] + VUNSPEC_VLLDM)] "use_cmse && reload_completed" "vlldm%?\\t%0" [(set_attr "predicable" "yes") -- 2.47.2