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authorLukas Larsson <[email protected]>2014-11-05 11:18:05 +0100
committerLukas Larsson <[email protected]>2014-11-24 16:35:22 +0100
commite3f4cd83939f28e17addac889208985196d22f22 (patch)
treee431db43b653ca2fc04e6f2f561c21cc019f49e3 /erts/emulator
parent509163307c31bf4f98a638b47ee03a5b99eb2c73 (diff)
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erts: Use finite instead of isfinite with gcc
Turns out that isfinite emits a function call and not an instruction in gcc, this makes estone float arith about 50-75% slower. finite emits the instruction so we use that instead.
Diffstat (limited to 'erts/emulator')
-rw-r--r--erts/emulator/sys/unix/erl_unix_sys.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h
index c3dba69acb..f7a6298d5b 100644
--- a/erts/emulator/sys/unix/erl_unix_sys.h
+++ b/erts/emulator/sys/unix/erl_unix_sys.h
@@ -229,6 +229,17 @@ extern void sys_stop_cat(void);
#ifdef USE_ISINF_ISNAN /* simulate finite() */
# define isfinite(f) (!isinf(f) && !isnan(f))
# define HAVE_ISFINITE
+#elif defined(__GNUC__) && defined(HAVE_FINITE)
+/* We use finite in gcc as it emits assembler instead of
+ the function call that isfinite emits. The assembler is
+ significantly faster. */
+# ifdef isfinite
+# undef isfinite
+# endif
+# define isfinite finite
+# ifndef HAVE_ISFINITE
+# define HAVE_ISFINITE
+# endif
#elif defined(isfinite) && !defined(HAVE_ISFINITE)
# define HAVE_ISFINITE
#elif !defined(HAVE_ISFINITE) && defined(HAVE_FINITE)