Commit Graph

4 Commits

Author SHA1 Message Date
Reid Kleckner 3fe67c9fc1 Require an x86 target for ms-inline-asm-return.cpp instead of XFAIL
llvm-svn: 217272
2014-09-05 20:06:06 +00:00
Renato Golin 65336d0a82 Mark ms-inline-asm as xfail on ARM
llvm-svn: 217241
2014-09-05 13:29:23 +00:00
Reid Kleckner 579c9513cb Add triple to ms-inline-asm-return.cpp test
llvm-svn: 217192
2014-09-04 20:16:12 +00:00
Reid Kleckner 9b3e3dfc54 MS inline asm: Allow __asm blocks to set a return value
If control falls off the end of a function after an __asm block, MSVC
assumes that the inline assembly filled the EAX and possibly EDX
registers with an appropriate return value. This functionality is used
in inline functions returning 64-bit integers in system headers, so we
need some amount of compatibility.

This is implemented in Clang by adding extra output constraints to every
inline asm block, and storing the resulting output registers into the
return value slot. If we see an asm block somewhere in the function
body, we emit a normal epilogue instead of marking the end of the
function with a return type unreachable.

Normal returns in functions not using this functionality will overwrite
the return value slot, and in most cases LLVM should be able to
eliminate the dead stores.

Fixes PR17201.

Reviewed By: majnemer

Differential Revision: http://reviews.llvm.org/D5177

llvm-svn: 217187
2014-09-04 20:04:38 +00:00