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Description: Add __volatile__ to asm(div)
This fixes the flint-arb issue on amd64 and i386. If that appears on other
architectures, then we need to also patch the asm(div)s for other arches.
.
See the GCC bug for a detailed explanation of this patch.
.
A more complete version of this patch is being discussed with GMP devs,
which will need to be upstreamed to FLINT when finalised:
Author: Ximin Luo <infinity0@debian.org>
Bug: https://github.com/fredrik-johansson/arb/issues/194
Bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82677#c9
Bug: https://gmplib.org/list-archives/gmp-bugs/2017-October/004231.html
Bug: https://gmplib.org/list-archives/gmp-bugs/2017-November/004235.html
---
This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
--- a/longlong.h
+++ b/longlong.h
@@ -65,12 +65,12 @@
: "%0" ((mp_limb_t)(u)), "rm" ((mp_limb_t)(v)))
#define udiv_qrnnd(q, r, n1, n0, dx) \
- __asm__ ("divq %4" \
+ __asm__ __volatile__ ("divq %4" \
: "=a" (q), "=d" (r) \
: "0" ((mp_limb_t)(n0)), "1" ((mp_limb_t)(n1)), "rm" ((mp_limb_t)(dx)))
#define sdiv_qrnnd(q, r, n1, n0, dx) \
- __asm__ ("idivq %4" \
+ __asm__ __volatile__ ("idivq %4" \
: "=a" (q), "=d" (r) \
: "0" ((mp_limb_t)(n0)), "1" ((mp_limb_t)(n1)), "rm" ((mp_limb_t)(dx)))
@@ -122,12 +122,12 @@
: "%0" ((mp_limb_t)(u)), "rm" ((mp_limb_t)(v)))
#define udiv_qrnnd(q, r, n1, n0, dx) \
- __asm__ ("divl %4" \
+ __asm__ __volatile__ ("divl %4" \
: "=a" (q), "=d" (r) \
: "0" ((mp_limb_t)(n0)), "1" ((mp_limb_t)(n1)), "rm" ((mp_limb_t)(dx)))
#define sdiv_qrnnd(q, r, n1, n0, dx) \
- __asm__ ("idivl %4" \
+ __asm__ __volatile__ ("idivl %4" \
: "=a" (q), "=d" (r) \
: "0" ((mp_limb_t)(n0)), "1" ((mp_limb_t)(n1)), "rm" ((mp_limb_t)(dx)))
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