From: Stefan Schulze Frielinghaus Date: Wed, 5 May 2021 15:06:52 +0000 (+0200) Subject: PR rtl-optimization/100263: Ensure register can change mode X-Git-Tag: releases/gcc-11.2.0~447 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fcad2894215879b740dce74e72247b6efa326397;p=thirdparty%2Fgcc.git PR rtl-optimization/100263: Ensure register can change mode For move2add_valid_value_p we also have to ask the target whether a register can be accessed in a different mode than it was set before. gcc/ChangeLog: PR rtl-optimization/100263 * postreload.c (move2add_valid_value_p): Ensure register can change mode. (cherry picked from commit bb283170e7a1f39bf533651418daf10ad18eccfc) --- diff --git a/gcc/postreload.c b/gcc/postreload.c index dc67643384d6..60a622dbaf3e 100644 --- a/gcc/postreload.c +++ b/gcc/postreload.c @@ -1725,7 +1725,8 @@ move2add_valid_value_p (int regno, scalar_int_mode mode) { scalar_int_mode old_mode; if (!is_a (reg_mode[regno], &old_mode) - || !MODES_OK_FOR_MOVE2ADD (mode, old_mode)) + || !MODES_OK_FOR_MOVE2ADD (mode, old_mode) + || !REG_CAN_CHANGE_MODE_P (regno, old_mode, mode)) return false; /* The value loaded into regno in reg_mode[regno] is also valid in mode after truncation only if (REG:mode regno) is the lowpart of