The testcase that I will attach when compiled with -O3 generates incorrect
results. Good results are obtained at -O0
The testcase should be compiled like this:
$ mipsel-linux-gcj --main=TestMultSimple -O2 TestMultSimple.java -o
TestMultSimple-O2
$ mipsel-linux-gcj --main=TestMultSimple -O0 TestMultSimple.java -o
TestMultSimple-O0
When running I get this:
/junk # ./TestMultSimple-O2
test10a3
off = -28800000 = 0800
soff = 1106931389806 = 2005.01.28 08:56:29.806
syscur = 1106960189806 = 2005.01.28 16:56:29.806
d = -5287802103562112000 = 7090.-33554411.-33554413 23:51:28.000
/junk # ./TestMultSimple-O0
test10a3
off = -28800000 = 0800
soff = 1106931392290 = 2005.01.28 08:56:32.290
syscur = 1106960192290 = 2005.01.28 16:56:32.290
d = 1106870400000 = 2005.01.27 16:00:00.000
The second result is correct. d should be a positive number of about the same
value as syscur.
When build with x86 targeted compiler the bug is not seen.
gcj (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3) for example gives good results.
--
Summary: MIPS wrong-code for 64-bit multiply from java program.
Product: gcc
Version: 3.4.3
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P2
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: daney at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-linux
GCC host triplet: i686-pc-linux
GCC target triplet: mipsel-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19683
