From d80c2beaf7d6f117fa52486f1006faec559fe1d2 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Sat, 25 Oct 2014 01:22:02 +0100 Subject: [PATCH] Optimize powerpc*-*-linux* 32-bit classic hard/soft float hardfp/soft-fp use. Continuing the cleanups of libgcc soft-fp configuration for powerpc*-*-linux* in preparation for implementing TARGET_ATOMIC_ASSIGN_EXPAND_FENV for soft-float and e500, this patch optimizes the choice of which functions to build for the 32-bit classic hard-float and soft-float cases. (e500 will be dealt with in a separate patch which will need to add new features to t-hardfp and t-softfp; this patch keeps the status quo for e500.) For hard-float, while the functions in question are part of the libgcc ABI there is no need for them to contain software floating point code: no newly built code should use them, and if anything does use them it's most efficient (space and speed) for them to pass straight through to floating-point hardware instructions; this case is made to use t-hardfp to achieve that. For soft-float, direct use of soft-fp functions for operations involving DImode or unsigned integers is more efficient than using the libgcc2.c versions of those operations to convert to operations on other types (which then end up calling soft-fp functions for those other types, possibly more than once); this case is thus stopped from using t-softfp-excl. (A future patch will stop the e500 cases from using t-softfp-excl as well.) Tested with no regressions for crosses to powerpc-linux-gnu (soft float and classic hard float); also checked that the same set of symbols and versions is exported from shared libgcc before and after the patch. * configure.ac (ppc_fp_type): Set variable on powerpc*-*-linux*. * configure: Regenerate. * config.host (powerpc*-*-linux*): Use $ppc_fp_type to determine additions to tmake_file. Use t-hardfp-sfdf and t-hardfp instead of soft-fp for 32-bit classic hard float. Do not use t-softfp-excl for soft float. From-SVN: r216687 --- libgcc/ChangeLog | 9 +++++++++ libgcc/config.host | 18 ++++++++++++++++-- libgcc/configure | 23 +++++++++++++++++++++++ libgcc/configure.ac | 23 +++++++++++++++++++++++ 4 files changed, 71 insertions(+), 2 deletions(-) diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog index 14b0e364b31..d1a3b7394da 100644 --- a/libgcc/ChangeLog +++ b/libgcc/ChangeLog @@ -1,3 +1,12 @@ +2014-10-25 Joseph Myers + + * configure.ac (ppc_fp_type): Set variable on powerpc*-*-linux*. + * configure: Regenerate. + * config.host (powerpc*-*-linux*): Use $ppc_fp_type to determine + additions to tmake_file. Use t-hardfp-sfdf and t-hardfp instead + of soft-fp for 32-bit classic hard float. Do not use + t-softfp-excl for soft float. + 2014-10-22 Joseph Myers * config.host (powerpc*-*-linux*): Only use soft-fp for 32-bit diff --git a/libgcc/config.host b/libgcc/config.host index 10c25f5384f..d6c7df73bbf 100644 --- a/libgcc/config.host +++ b/libgcc/config.host @@ -991,9 +991,23 @@ powerpc-*-rtems*) ;; powerpc*-*-linux*) tmake_file="${tmake_file} rs6000/t-ppccomm rs6000/t-savresfgpr rs6000/t-crtstuff rs6000/t-linux t-dfprules rs6000/t-ppc64-fp t-slibgcc-libgcc" - if test "${host_address}" = 32; then + case $ppc_fp_type in + 64) + ;; + hard) + tmake_file="${tmake_file} t-hardfp-sfdf t-hardfp" + ;; + soft) + tmake_file="${tmake_file} t-softfp-sfdf t-softfp" + ;; + e500v1|e500v2) tmake_file="${tmake_file} t-softfp-sfdf t-softfp-excl t-softfp" - fi + ;; + *) + echo "Unknown ppc_fp_type $ppc_fp_type" 1>&2 + exit 1 + ;; + esac extra_parts="$extra_parts ecrti.o ecrtn.o ncrti.o ncrtn.o" md_unwind_header=rs6000/linux-unwind.h ;; diff --git a/libgcc/configure b/libgcc/configure index 19c4ed69b19..7a154db9de9 100644 --- a/libgcc/configure +++ b/libgcc/configure @@ -4376,6 +4376,29 @@ fi $as_echo "$libgcc_cv_mips_hard_float" >&6; } esac +# Determine floating-point type for powerpc*-*-linux*. +# Single-precision-only FPRs are not a supported configuration for +# this target, so are not allowed for in this test. +case ${host} in +powerpc*-*-linux*) + cat > conftest.c < conftest.c <