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Split Makefile symbol CFLAGS_VECTOR into two symbols.

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Replace CFLAGS_VECTOR with CFLAGS_UNROLL_LOOPS and CFLAGS_VECTORIZE,
allowing us to distinguish whether we want to apply -funroll-loops,
-ftree-vectorize, or both to a particular source file.  Up to now
the only consumer of the symbol has been checksum.c which wants
both, so that there was no need to distinguish; but that's about
to change.

Amit Khandekar, reviewed and edited a little by me

Discussion: https://postgr.es/m/CAJ3gD9evtA_vBo+WMYMyT-u=keHX7-r8p2w7OSRfXf42LTwCZQ@mail.gmail.com
This commit is contained in:
Tom Lane
2020-09-06 21:28:16 -04:00
parent 784b1ba1a2
commit 695de5d1ed
4 changed files with 34 additions and 22 deletions
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17
configure.ac
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@ -466,9 +466,12 @@ BITCODE_CFLAGS=""
user_BITCODE_CXXFLAGS=$BITCODE_CXXFLAGS
BITCODE_CXXFLAGS=""
# set CFLAGS_VECTOR from the environment, if available
if test "$ac_env_CFLAGS_VECTOR_set" = set; then
CFLAGS_VECTOR=$ac_env_CFLAGS_VECTOR_value
# set CFLAGS_UNROLL_LOOPS and CFLAGS_VECTORIZE from the environment, if present
if test "$ac_env_CFLAGS_UNROLL_LOOPS_set" = set; then
CFLAGS_UNROLL_LOOPS=$ac_env_CFLAGS_UNROLL_LOOPS_value
fi
if test "$ac_env_CFLAGS_VECTORIZE_set" = set; then
CFLAGS_VECTORIZE=$ac_env_CFLAGS_VECTORIZE_value
fi
# Some versions of GCC support some additional useful warning flags.
@ -512,9 +515,10 @@ if test "$GCC" = yes -a "$ICC" = no; then
# Disable FP optimizations that cause various errors on gcc 4.5+ or maybe 4.6+
PGAC_PROG_CC_CFLAGS_OPT([-fexcess-precision=standard])
PGAC_PROG_CXX_CFLAGS_OPT([-fexcess-precision=standard])
# Optimization flags for specific files that benefit from loop unrolling
PGAC_PROG_CC_VAR_OPT(CFLAGS_UNROLL_LOOPS, [-funroll-loops])
# Optimization flags for specific files that benefit from vectorization
PGAC_PROG_CC_VAR_OPT(CFLAGS_VECTOR, [-funroll-loops])
PGAC_PROG_CC_VAR_OPT(CFLAGS_VECTOR, [-ftree-vectorize])
PGAC_PROG_CC_VAR_OPT(CFLAGS_VECTORIZE, [-ftree-vectorize])
# We want to suppress clang's unhelpful unused-command-line-argument warnings
# but gcc won't complain about unrecognized -Wno-foo switches, so we have to
# test for the positive form and if that works, add the negative form
@ -555,7 +559,8 @@ elif test "$PORTNAME" = "hpux"; then
PGAC_PROG_CXX_CFLAGS_OPT([+Olibmerrno])
fi
AC_SUBST(CFLAGS_VECTOR)
AC_SUBST(CFLAGS_UNROLL_LOOPS)
AC_SUBST(CFLAGS_VECTORIZE)
# Determine flags used to emit bitcode for JIT inlining. Need to test
# for behaviour changing compiler flags, to keep compatibility with