#17749: GMP-ECM using deprecated asm syntax on mips architecture
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Reporter: etn40ff | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: packages: standard | Keywords: GMP-ECM
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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According to GCC 4.4 release notes:
"""
The MIPS port no longer recognizes the h asm constraint. It was necessary
to remove this constraint in order to avoid generating unpredictable code
sequences.
One of the main uses of the h constraint was to extract the high part of a
multiplication on 64-bit targets. For example:
{{{
asm ("dmultu\t%1,%2" : "=h" (result) : "r" (x), "r" (y));
}}}
You can now achieve the same effect using 128-bit types:
{{{
typedef unsigned int uint128_t __attribute__((mode(TI)));
result = ((uint128_t) x * y) >> 64;
}}}
The second sequence is better in many ways. For example, if x and y are
constants, the compiler can perform the multiplication at compile time. If
x and y are not constants, the compiler can schedule the runtime
multiplication better than it can schedule an asm statement.
"""
Unfortunately the latest version of GMP-ECM still uses this construction
making it impossible to build on mips:
{{{
...
In file included from sp.h:90:0,
from sp.c:23:
sp.c: In function 'sp_spp':
longlong.h:936:3: error: impossible constraint in 'asm'
__asm__ ("multu %2,%3" : "=l" (w0), "=h" (w1) : "d" (u), "d" (v))
^
sp.h:425:3: note: in expansion of macro 'umul_ppmm'
umul_ppmm (u, v, x, y);
^
longlong.h:936:3: error: impossible constraint in 'asm'
__asm__ ("multu %2,%3" : "=l" (w0), "=h" (w1) : "d" (u), "d" (v))
^
sp.h:406:3: note: in expansion of macro 'umul_ppmm'
umul_ppmm (q2, tmp, q1, di);
^
longlong.h:936:3: error: impossible constraint in 'asm'
__asm__ ("multu %2,%3" : "=l" (w0), "=h" (w1) : "d" (u), "d" (v))
^
sp.h:407:3: note: in expansion of macro 'umul_ppmm'
umul_ppmm (dqh, dql, q2, d);
^
longlong.h:936:3: error: impossible constraint in 'asm'
__asm__ ("multu %2,%3" : "=l" (w0), "=h" (w1) : "d" (u), "d" (v))
^
sp.h:434:3: note: in expansion of macro 'umul_ppmm'
umul_ppmm (u, v, x, x);
^
longlong.h:936:3: error: impossible constraint in 'asm'
__asm__ ("multu %2,%3" : "=l" (w0), "=h" (w1) : "d" (u), "d" (v))
^
sp.h:406:3: note: in expansion of macro 'umul_ppmm'
umul_ppmm (q2, tmp, q1, di);
^
longlong.h:936:3: error: impossible constraint in 'asm'
__asm__ ("multu %2,%3" : "=l" (w0), "=h" (w1) : "d" (u), "d" (v))
^
sp.h:407:3: note: in expansion of macro 'umul_ppmm'
umul_ppmm (dqh, dql, q2, d);
^
longlong.h:936:3: error: impossible constraint in 'asm'
__asm__ ("multu %2,%3" : "=l" (w0), "=h" (w1) : "d" (u), "d" (v))
^
sp.h:434:3: note: in expansion of macro 'umul_ppmm'
umul_ppmm (u, v, x, x);
^
longlong.h:936:3: error: impossible constraint in 'asm'
__asm__ ("multu %2,%3" : "=l" (w0), "=h" (w1) : "d" (u), "d" (v))
^
sp.h:406:3: note: in expansion of macro 'umul_ppmm'
umul_ppmm (q2, tmp, q1, di);
^
longlong.h:936:3: error: impossible constraint in 'asm'
__asm__ ("multu %2,%3" : "=l" (w0), "=h" (w1) : "d" (u), "d" (v))
^
sp.h:407:3: note: in expansion of macro 'umul_ppmm'
umul_ppmm (dqh, dql, q2, d);
^
...
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/17749>
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