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[Bug target/70465] [5/6/7 Regression] Poor code for x87 asm
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 26 Jan 2017 08:47:08 +0000
- Subject: [Bug target/70465] [5/6/7 Regression] Poor code for x87 asm
- Auto-submitted: auto-generated
- References: <bug-70465-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70465
--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Jan 26 08:46:36 2017
New Revision: 244921
URL: https://gcc.gnu.org/viewcvs?rev=244921&root=gcc&view=rev
Log:
PR target/70465
* reg-stack.c (emit_swap_insn): Instead of fld a; fld b; fxchg %st(1);
emit fld b; fld a; if possible.
* gcc.target/i386/pr70465.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr70465.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/reg-stack.c
trunk/gcc/testsuite/ChangeLog