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[PATCH, i386] Optimize handling of fpsr reg

From: Uros Bizjak <ubizjak at gmail dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Fri, 28 Sep 2018 17:22:12 +0200
Subject: [PATCH, i386] Optimize handling of fpsr reg

Hello!

FPSR_REG was introduced to implement reduction loop of fmod and
remainder x87 sequences. There is no point to declare it as a generic
CCmode register and also no point to mark it as clobbered in every asm
insn.

2018-09-28  Uros Bizjak  <ubizjak@gmail.com>

    * config/i386/i386.h (CC_REGNO): Remove FPSR_REG.
    * config/i386/i386.c (ix86_fixed_condition_code_regs): Use
    INVALID_REGNUM instead of FPSR_REG.
    (ix86_md_asm_adjust): Do not clobber FPSR_REG.
    * config/i386/i386.md: Update comment of FP compares.
    (fldenv): Do not clobber FPSR_REG.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Committed to mainline SVN.

Uros.

Attachment: p.diff.txt
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