From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id 567903854148; Wed, 30 Aug 2023 12:38:00 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 567903854148 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1693399080; bh=HDhtPM5PW6cwEg1ibRuIxw6tKLSHe503swQhobHF94k=; h=From:To:Subject:Date:From; b=nGsSUJwgDuOuwCLTcNP9vkeYFCiOoLXlJTvYmaeFW6qalQDlbXgrNYP6xMCMv2ecS DucaUGQdeSKl8t7wYT9oRyNaQCuzbSJJvtzU+3aFCPEDedcW13R5Ti/TAaYw7RUpfV 0U0oGISEfsyHMirKVPSRiq4w6GmiZdIZvjC85A/c= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Adhemerval Zanella To: glibc-cvs@sourceware.org Subject: [glibc/azanella/clang] Use -ffloat-store iff compiler supports it X-Act-Checkin: glibc X-Git-Author: Adhemerval Zanella X-Git-Refname: refs/heads/azanella/clang X-Git-Oldrev: 288013026b33991b6c875c3d186966fde9a2b607 X-Git-Newrev: 58c049fccb3b6a40f88a7c14600677ca8da1fa5e Message-Id: <20230830123800.567903854148@sourceware.org> Date: Wed, 30 Aug 2023 12:38:00 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=58c049fccb3b6a40f88a7c14600677ca8da1fa5e commit 58c049fccb3b6a40f88a7c14600677ca8da1fa5e Author: Adhemerval Zanella Date: Thu Mar 24 13:12:43 2022 -0300 Use -ffloat-store iff compiler supports it Diff: --- configure | 24 ++++++++++++++++++++++++ configure.ac | 10 ++++++++++ math/Makefile | 4 ++-- 3 files changed, 36 insertions(+), 2 deletions(-) diff --git a/configure b/configure index 004108d180..0f3c8818d3 100755 --- a/configure +++ b/configure @@ -7466,6 +7466,30 @@ printf "%s\n" "$libc_cv_cc_rounding_math" >&6; } config_vars="$config_vars config-cflags-frounding-math = $libc_cv_cc_rounding_math" +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for compiler option that -ffloat-store" >&5 +printf %s "checking for compiler option that -ffloat-store... " >&6; } +if test ${libc_cv_cc_float_store+y} +then : + printf %s "(cached) " >&6 +else $as_nop + if { ac_try='${CC-cc} -Werror -ffloat-store -xc /dev/null -S -o /dev/null' + { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 + (eval $ac_try) 2>&5 + ac_status=$? + printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 + test $ac_status = 0; }; } +then : + libc_cv_cc_float_store=-ffloat-store +else $as_nop + libc_cv_cc_float_store= +fi + +fi +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_float_store" >&5 +printf "%s\n" "$libc_cv_cc_float_store" >&6; } +config_vars="$config_vars +config-cflags-float-store = $libc_cv_cc_float_store" + { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if $CC accepts -fno-tree-loop-distribute-patterns with \ __attribute__ ((__optimize__))" >&5 printf %s "checking if $CC accepts -fno-tree-loop-distribute-patterns with \ diff --git a/configure.ac b/configure.ac index ecb4e7086e..7a9df2818a 100644 --- a/configure.ac +++ b/configure.ac @@ -1535,6 +1535,16 @@ LIBC_TRY_CC_OPTION([-Werror -frounding-math], LIBC_CONFIG_VAR([config-cflags-frounding-math], [$libc_cv_cc_rounding_math]) +dnl Determine if compiler supports -ffloat-store +AC_CACHE_CHECK([for compiler option that -ffloat-store], + libc_cv_cc_float_store, [dnl +LIBC_TRY_CC_OPTION([-Werror -ffloat-store], + [libc_cv_cc_float_store=-ffloat-store], + [libc_cv_cc_float_store=]) +]) +LIBC_CONFIG_VAR([config-cflags-float-store], + [$libc_cv_cc_float_store]) + AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \ __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl cat > conftest.c <3 million), so it may take a