Package: ntl
Version: 5.4.2-4
Severity: serious
Since GCC 4.4 it's not possible anymore to use the 'h' constraints for
MIPS inline assembly code when doing a multiplication. That's why sprng
fails to build from source on mips and mipsel.
That said GCC supports 32x32 => 64 multiplication on 32-bit architecture
for a lot of time, so there is no need to use assembly code for that.
The patch below fixes the problem by using standard multiplication
instead of assembly code. I have also included the code for MIPS64 using
128-bit hints for reference (the second hunk), though it is not used in
Debian.
--- ntl-5.4.2.orig/include/NTL/SPMM_ASM.h
+++ ntl-5.4.2/include/NTL/SPMM_ASM.h
@@ -147,8 +147,8 @@
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
- unsigned long hi, lo;
- __asm__ ("multu %2,%3" : "=l" (lo), "=h" (hi) : "d" (a), "d" (b));
+ unsigned long hi;
+ hi = ((unsigned long long) a * b) >> 32;
return hi;
}
@@ -159,8 +159,9 @@
static inline unsigned long MulHiUL(unsigned long a, unsigned long b)
{
- unsigned long hi, lo;
- __asm__ ("dmultu %2,%3" : "=l" (lo), "=h" (hi) : "d" (a), "d" (b));
+ typedef unsigned int uint128_t __attribute__((mode(TI)));
+ unsigned long hi;
+ hi = ((uint128_t) a * b) >> 64;
return hi;
}
-- System Information:
Debian Release: wheezy/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: mips (mips64)
Kernel: Linux 2.6.32-5-5kc-malta
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
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