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[PATCH, i386]: Fix PR85950, Unsafe-math-optimizations regresses optimization using SSE4.1 roundss

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: Tue, 29 May 2018 20:38:43 +0200
Subject: [PATCH, i386]: Fix PR85950, Unsafe-math-optimizations regresses optimization using SSE4.1 roundss

Hello!

Attached patch enables l<rounding_insn><MODEF:mode><SWI48:mode>2 for
TARGET_SSE4.1, and while there, also corrects operand 1 predicate of
rounds{s,d} instruction.

2018-05-29  Uros Bizjak  <ubizjak@gmail.com>

    PR target/85950
    * config/i386/i386.md (l<rounding_insn><MODEF:mode><SWI48:mode>2):
    Enable for TARGET_SSE4_1 and generate rounds{s,d} and cvtts{s,d}2si{,q}
    sequence.
    (sse4_1_round<mode>2): Use nonimmediate_operand
    for operand 1 predicate.

testsuite/ChangeLog:

2018-05-29  Uros Bizjak  <ubizjak@gmail.com>

    PR target/85950
    * gcc.target/i386/pr85950.c: New test.

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

Committed to mainline SVN.

Uros.

Attachment: p.diff.txt
Description: Text document

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