http://llvm.org/bugs/show_bug.cgi?id=9659
Summary: Please support __int128_t and _uint128_t on 64-bit
platforms!
Product: clang
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
gcc supports __int128_t and __uint128_t on 64-bit platforms, so it is possible
to make use of the 64*64->128 bit multiply instructions directly.
In particular, a 128-bit integer type is needed to take advantage of 64-bit
integers when implementing a bignum library in C on 64-bit platforms. Most
bignum libraries are implemented in assembly language because compilers
historically produced much worse code than hand-crafted assembly trickery
could, but nowadays compilers ought to be able to do well with C code, too. In
fact, it would be a great opportunity for perfecting the register allocator.
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