emscripten-fastcomp/test/CodeGen/X86/stack-align-memcpy.ll, branch 1.13.2LLVM with the emscripten fastcomp javascript backendhttps://git.amat.us/emscripten-fastcomp/atom/test/CodeGen/X86/stack-align-memcpy.ll?h=1.13.22013-02-13T13:40:35ZX86: Disable generation of rep;movsl when %esi is used as a base pointer.2013-02-13T13:40:35ZBenjamin Kramerbenny.kra@googlemail.com2013-02-13T13:40:35Zurn:sha1:f09e02f01a817f4daf95ef8d3f1f2545297d32e7
This happens when there is both stack realignment and a dynamic alloca in the
function. If we overwrite %esi (rep;movsl uses fixed registers) we'll lose the
base pointer and the next register spill will write into oblivion.
Fixes PR15249 and unbreaks firefox on i386/freebsd. Mozilla uses dynamic allocas
and freebsd a 4 byte stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175057 91177308-0d34-0410-b5e6-96231b3b80d8