Package: gcc-4.4
Version: 4.4.5-10
Severity: normal
For the following two functions,
void foo(const float * __restrict__ input, float * __restrict__ output)
{
unsigned int pos;
for (pos = 0; pos < 10100; pos++)
output[pos] = input[pos] * 0.1;
}
void bar(const float * __restrict__ input, float * __restrict__ output)
{
unsigned int pos;
unsigned int i;
for (pos = 0; pos <= 10000; pos += 100)
for (i = 0; i < 100; i++)
output[pos + i] = input[pos + i] * 0.1;
}
compiled with
gcc -O3 -ftree-vectorizer-verbose=5 -msse2 -m32 -c main.c
vectorizes both foo and bar. However, compiled without the -m32
gcc -O3 -ftree-vectorizer-verbose=5 -msse2 -c main.c
will only vectorize foo, and not bar. They should both be vectorized on both
platforms.
-- System Information:
Debian Release: wheezy/sid
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages gcc-4.4 depends on:
ii binutils 2.20.1-16 The GNU assembler, linker and bina
ii cpp-4.4 4.4.5-10 The GNU C preprocessor
ii gcc-4.4-base 4.4.5-10 The GNU Compiler Collection (base
ii libc6 2.11.2-11 Embedded GNU C Library: Shared lib
ii libgcc1 1:4.4.5-10 GCC support library
ii libgomp1 4.4.5-10 GCC OpenMP (GOMP) support library
Versions of packages gcc-4.4 recommends:
ii libc6-dev 2.11.2-11 Embedded GNU C Library: Developmen
Versions of packages gcc-4.4 suggests:
pn gcc-4.4-doc <none> (no description available)
pn gcc-4.4-locales <none> (no description available)
ii gcc-4.4-multilib 4.4.5-10 The GNU C compiler (multilib files
pn libcloog-ppl0 <none> (no description available)
pn libgcc1-dbg <none> (no description available)
pn libgomp1-dbg <none> (no description available)
pn libmudflap0-4.4-dev <none> (no description available)
pn libmudflap0-dbg <none> (no description available)
pn libppl-c2 <none> (no description available)
pn libppl7 <none> (no description available)
-- no debconf information
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