maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/MC/COFF/comm.ll

14 lines
369 B
LLVM
Raw Normal View History

Fix alignment of .comm and .lcomm on mingw32. For some reason .lcomm uses byte alignment and .comm log2 alignment so we can't use the same setting for both. Fix this by reintroducing the LCOMM enum. I verified this against mingw's gcc. llvm-svn: 163420
2012-09-08 05:08:01 +08:00
; RUN: llc -mtriple i386-pc-mingw32 < %s | FileCheck %s
@a = internal global i8 0, align 1
@b = internal global double 0.000000e+00, align 8
@c = common global i8 0, align 1
@d = common global double 0.000000e+00, align 8
; .lcomm uses byte alignment
; CHECK: .lcomm _a,1
; CHECK: .lcomm _b,8,8
; .comm uses log2 alignment
MC: Support aligned COMMON symbols for COFF link.exe: Fuzz testing has shown that COMMON symbols with size > 32 will always have an alignment of at least 32 and all symbols with size < 32 will have an alignment of at least the largest power of 2 less than the size of the symbol. binutils: The BFD linker essentially work like the link.exe behavior but with alignment 4 instead of 32. The BFD linker also supports an extension to COFF which adds an -aligncomm argument to the .drectve section which permits specifying a precise alignment for a variable but MC currently doesn't support editing .drectve in this way. With all of this in mind, we decide to play a little trick: we can ensure that the alignment will be respected by bumping the size of the global to it's alignment. llvm-svn: 218201
2014-09-21 17:18:07 +08:00
; CHECK: .comm _c,1,0
; CHECK: .comm _d,8,3