Package: gcc-4.0
Version: 4.0.1-6
Severity: important
When compiling the fesetround function (which controls the processor
rounding mode), gcc-4.0 incorrectly optimizes away the code!!!
Here's the C code in question:
__asm__ ("fstd %%fr0,0(%1)" : "=m" (*sw) : "r" (sw));
sw[0] &= ~FE_DOWNWARD;
sw[0] |= round;
__asm__ ("fldd 0(%0),%%fr0" : : "r" (sw));
gcc-3.3 outputs:
#APP
fstd %fr0,0(%r20)
#NO_APP
ldw -56(%r30),%r19
depi 0,22,2,%r19
or %r19,%r26,%r19
stw %r19,-56(%r30)
#APP
fldd 0(%r20),%fr0
#NO_APP
gcc-4.0 outputs:
#APP
fstd %fr0,0(%r28)
fldd 0(%r28),%fr0
#NO_APP
Due to this bug, the rounding mode is broken for all clients of
libc on hppa. It's hard to judge how many applications are affected
since the failure is silent and simply results in incorrect
calculations. This may lead to any number of bugs...
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing')
Architecture: hppa (parisc64)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.12-1-64-smp
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages gcc-4.0 depends on:
ii binutils 2.16.1-2 The GNU assembler, linker and bina
ii cpp-4.0 4.0.1-6 The GNU C preprocessor
ii gcc-4.0-base 4.0.1-6 The GNU Compiler Collection (base
ii libc6 2.3.5-6 GNU C Library: Shared libraries an
ii libgcc2 4.0.1-6 GCC support library
Versions of packages gcc-4.0 recommends:
ii libc6-dev 2.3.5-6 GNU C Library: Development Librari
pn libmudflap0-dev <none> (no description available)
-- no debconf information
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