http://llvm.org/bugs/show_bug.cgi?id=19261
Bug ID: 19261
Summary: unconditional branch is not generated with -O0
-fast-isel=false
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12301
--> http://llvm.org/bugs/attachment.cgi?id=12301&action=edit
input for llc
llc doesn't generate nodes for unconditional fall-through branches for targets
without FastISel implementation (X86 has it, but can be disabled by
"-fast-isel=false") SelectionDAGBuilder::visitBr().
So for line 4 in the following testcase
1: void foo(int i){
2: switch(i){
3: default:
4: break;
5: }
6: return;
7: }
there is no corresponding line in .debug_line section, and a debugger cannot
set a breakpoint at line 4.
The test.ll IR file is attached (generated with clang -g -O0).
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