From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id F1B40389839D; Thu, 28 Sep 2023 17:53:39 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F1B40389839D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1695923619; bh=plhZ13M+V+1QOVa93iOTyJAmeo675LGdOZbHy0hdq0k=; h=From:To:Subject:Date:From; b=ND3t7gqXAfZ7hUpA4KPXFuKsyxXoNGU67NU/EUkWdwWYnzr9/+Sy/Mz5qnPJS19qP 5t/3vs8vkI4kSyMbk0IGhLebiFL7QOw1FSOaOWLIQVQTf/H+JbIafFV00UGTs1pzjw nV5ZiMT3sR3O3F+dumN4vXu+D1i+fPGOY0BrkLCA= 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: 7d3353535f976531d49fc0fe6bbb0a1ec28b6c8f X-Git-Newrev: 8f5416d1a80cdb7901f8e793ae2933893518b4d8 Message-Id: <20230928175339.F1B40389839D@sourceware.org> Date: Thu, 28 Sep 2023 17:53:39 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8f5416d1a80cdb7901f8e793ae2933893518b4d8 commit 8f5416d1a80cdb7901f8e793ae2933893518b4d8 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 90c1f2ddaa..086eb8fda3 100755 --- a/configure +++ b/configure @@ -7490,6 +7490,30 @@ 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 $CC accepts -fno-tree-loop-distribute-patterns with \ diff --git a/configure.ac b/configure.ac index edf7c21a20..1467704750 100644 --- a/configure.ac +++ b/configure.ac @@ -1543,6 +1543,16 @@ LIBC_TRY_CC_OPTION([-Werror -frounding-math], LIBC_CONFIG_VAR([config-cflags-frounding-math], [$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