> /usr/local/gcc43/bin/gcc -v
Using built-in specs.
Target: i386-apple-darwin9.2.0
Configured with: ../gcc/configure --prefix=/usr/local/gcc43
--enable-threads=posix --with-arch=core2 --with-tune=core2 --with-gmp=/sw
--with-mpfr=/sw --disable-nls --disable-bootstrap --enable-checking=yes,rtl
CFLAGS=-g LDFLAGS=/usr/lib/libiconv.dylib --enable-languages=c,c++,objc,obj-c++
Thread model: posix
gcc version 4.4.0 20080219 (experimental) (GCC)
> /usr/local/gcc43/bin/gcc -Os -fno-PIC -S u64mul.c -fomit-frame-pointer
gcc generates:
_mul32:
pushl %ebx
xorl %edx, %edx
subl $8, %esp
movl _b, %eax
movl _a, %ecx
movl _a+4, %ebx
imull %edx, %ecx
imull %eax, %ebx
mull _a
addl %ebx, %ecx
leal (%ecx,%edx), %edx
popl %ecx
popl %ebx
popl %ebx
ret
and somehow leaves all the stuff with edx in.
4.1.3 generates:
mul32:
movl _b, %eax
movl _a+4, %ecx
imull %eax, %ecx
mull _a
addl %edx, %ecx
movl %ecx, %edx
ret
They both generate bad code for mul16.
--
Summary: [4.3 regression] multiply with 0 generated for 64*32->64
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: astrange at ithinksw dot com
GCC build triplet: i386-apple-darwin9.2.0
GCC host triplet: i386-apple-darwin9.2.0
GCC target triplet: i386-apple-darwin9.2.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35281
