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2013 Mar 25
1
[LLVMdev] Debug metadata after simplifications
...sations
that metadata seems to disappear.
For example, when -simplifycfg removes a block because it only contains
a branch, and -loop-simplify recreates that block because it turned out
to be a back-edge of some loop, the metadata gets removed.
Specifically, using the following testcase:
while (while_test()) {
if (if_test()) {
foo();
} else {
bar();
}
}
... Clang emits* the following IR:
*after slightly modifying the code generator so that it also emits
metadata for unconditional branches
while.cond:
%call = call zeroext i1 (...)* @while_test(), !dbg !8
br i1 %ca...