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[MCDwarf] Do not emit useless line table opcode.

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No need to emit a DW_LNS_advance_pc with a 0 increment. Found out while
comparing dsymutil's and LLVM's line table encoding. Not a correctenss
fix, just a small encoding size optimization.

I'm not sure how to generate a sequence that triggers this, and moreover
llvm-dwardump doesn't dump the line table program, thus the effort
involved in creating a testcase for this trivial patch seemed out of
proportion.

llvm-svn: 232332
This commit is contained in:
Frederic Riss 2015-03-15 20:45:39 +00:00
parent 449078e945
commit 2065721bd8
1 changed files with 1 additions and 1 deletions
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2
lib/MC/MCDwarf.cpp
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@ -446,7 +446,7 @@ void MCDwarfLineAddr::Encode(MCContext &Context, int64_t LineDelta,
if (LineDelta == INT64_MAX) {
if (AddrDelta == MAX_SPECIAL_ADDR_DELTA)
OS << char(dwarf::DW_LNS_const_add_pc);
else {
else if (AddrDelta) {
OS << char(dwarf::DW_LNS_advance_pc);
encodeULEB128(AddrDelta, OS);
}