can a gatekeeper help review this patch
This is a round off issue in IA64 system relative open64 library, the libffio.a.
we use opencc -O3 to build libffio.a, the round off option in -O3 is
-OPT:ro=2, it allow reassociation transforma\
tions.
in line 531 of file osprey/libu/numconv/mpp/defgu2s.c
expression
pre_result = a*x + (a*y + x*b +(b*y
+ (table_high*exact_low_number +
exact_high_number*table_low +
table_low*exact_low_number)));
the compiler will re-associated it to
pre_result = (a*x + a*y + x*b + b*y) +
(table_high*exact_low_number +
exact_high_number*table_low +
table_low*exact_low_number);
so do the precision of pre_result, this difference may affect the
result of 200.sixtrack and them get outp\
ut difference error.
Here is my patch, I just add -OPT:ro=1 to make file defgu2s.c when
building library libffio.a
===================================================================
--- osprey/libu/Makefile.gbase (revision 3495)
+++ osprey/libu/Makefile.gbase (working copy)
@@ -358,3 +358,15 @@
./massage > numbers.h
endif
+ifeq ($(BUILD_ARCH), IA64)
+ ifeq ($(BUILD_COMPILER), OSP)
+defgu2s.o : defgu2s.c
+ $(cc) -c $(CPPFLAGS) $(CFLAGS) -OPT:ro=1 $< -o $@
+
+defgu2s.pic.o : defgu2s.c
+ $(cc) $(pic_flag) -c $(CPPFLAGS) $(CFLAGS) -OPT:ro=1 $< -o $@
+
+defgu2s.pg.o : defgu2s.c
+ $(cc) $(prof_flag) -c $(CPPFLAGS) $(CFLAGS) -OPT:ro=1 $< -o $@
+ endif
+endif
\ No newline at end of file
--
yongchong
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