https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120427
Bug ID: 120427
Summary: [12/13/14/15/16 Regression] "and $0,mem" is generated
without -Oz
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: liuhongt at gcc dot gnu.org, roger at nextmovesoftware dot
com,
ubizjak at gmail dot com
Target Milestone: ---
commit ef26c151c14a87177d46fd3d725e7f82e040e89f
Author: Roger Sayle <ro...@nextmovesoftware.com>
Date: Thu Dec 23 12:33:07 2021 +0000
x86: PR target/103773: Fix wrong-code with -Oz from pop to memory.
transformed "mov $0,mem" to the shorter and "$0,mem" for -Oz. But
(define_insn "*mov<mode>_and"
[(set (match_operand:SWI248 0 "memory_operand" "=m")
(match_operand:SWI248 1 "const0_operand"))
(clobber (reg:CC FLAGS_REG))]
"reload_completed"
"and{<imodesuffix>}\t{%1, %0|%0, %1}"
[(set_attr "type" "alu1")
(set_attr "mode" "<MODE>")
(set_attr "length_immediate" "1")])
isn't guarded for -Oz. As the result, "and $0,mem" is generated without -Oz.
