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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/azanella/clang] x86: Use -mfpmath=387 iff compiler supports it Date: Tue, 2 Apr 2024 15:55:29 +0000 (GMT) [thread overview] Message-ID: <20240402155529.3521B3858D32@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9d6f5451911fdb6409b35685a24cc28248899e59 commit 9d6f5451911fdb6409b35685a24cc28248899e59 Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Thu Mar 24 15:02:05 2022 -0300 x86: Use -mfpmath=387 iff compiler supports it Diff: --- sysdeps/x86/configure | 24 ++++++++++++++++++++++++ sysdeps/x86/configure.ac | 10 ++++++++++ sysdeps/x86/fpu/Makefile | 5 ++++- 3 files changed, 38 insertions(+), 1 deletion(-) diff --git a/sysdeps/x86/configure b/sysdeps/x86/configure index 2a5421bb31..01f0285222 100644 --- a/sysdeps/x86/configure +++ b/sysdeps/x86/configure @@ -158,6 +158,30 @@ x86-isa-level-3-or-above = 3 4" config_vars="$config_vars enable-x86-isa-level = $libc_cv_include_x86_isa_level" +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if compiler supports -mpfmath=387" >&5 +printf %s "checking if compiler supports -mpfmath=387... " >&6; } +if test ${libc_cv_cc_mfpmath_387+y} +then : + printf %s "(cached) " >&6 +else $as_nop + if { ac_try='${CC-cc} -Werror -mfpmath=387 -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_mfpmath_387="-mfpmath=387" +else $as_nop + libc_cv_cc_mfpmath_387= +fi + +fi +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_mfpmath_387" >&5 +printf "%s\n" "$libc_cv_cc_mfpmath_387" >&6; } +config_vars="$config_vars +config-cflags-mfpath-387 = $libc_cv_cc_mfpmath_387" + printf "%s\n" "#define SUPPORT_STATIC_PIE 1" >>confdefs.h diff --git a/sysdeps/x86/configure.ac b/sysdeps/x86/configure.ac index 78ff7c8f41..26aad5d648 100644 --- a/sysdeps/x86/configure.ac +++ b/sysdeps/x86/configure.ac @@ -109,5 +109,15 @@ LIBC_CONFIG_VAR([have-x86-isa-level], [$libc_cv_have_x86_isa_level]) LIBC_CONFIG_VAR([x86-isa-level-3-or-above], [3 4]) LIBC_CONFIG_VAR([enable-x86-isa-level], [$libc_cv_include_x86_isa_level]) +dnl Determine if compiler supports -mfpmath=387 +AC_CACHE_CHECK([if compiler supports -mpfmath=387], + libc_cv_cc_mfpmath_387, [dnl +LIBC_TRY_CC_OPTION([-Werror -mfpmath=387], + [libc_cv_cc_mfpmath_387="-mfpmath=387"], + [libc_cv_cc_mfpmath_387=]) +]) +LIBC_CONFIG_VAR([config-cflags-mfpath-387], + [$libc_cv_cc_mfpmath_387]) + dnl Static PIE is supported. AC_DEFINE(SUPPORT_STATIC_PIE) diff --git a/sysdeps/x86/fpu/Makefile b/sysdeps/x86/fpu/Makefile index 68bd42cdd3..2d584dbfeb 100644 --- a/sysdeps/x86/fpu/Makefile +++ b/sysdeps/x86/fpu/Makefile @@ -4,7 +4,10 @@ CPPFLAGS += -I../soft-fp libm-support += powl_helper tests += test-fenv-sse test-fenv-clear-sse test-fenv-x87 test-fenv-sse-2 \ - test-flt-eval-method-387 test-flt-eval-method-sse + test-flt-eval-method-sse +ifneq ($(config-cflags-mfpath-387),) +tests += test-flt-eval-method-387 +endif CFLAGS-test-fenv-sse.c += -msse2 -mfpmath=sse CFLAGS-test-fenv-clear-sse.c += -msse2 -mfpmath=sse CFLAGS-test-fenv-sse-2.c += -msse2 -mfpmath=sse
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