https://bugs.llvm.org/show_bug.cgi?id=50874
Bug ID: 50874
Summary: [SelectionDAGBuilder] Bad machine code: MBB has
duplicate entries in its successor list
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
int a;
volatile unsigned b;
short c;
long d;
void e() {
f:
b;
g:
if (a)
;
else {
int h;
if (d)
goto f;
if (c)
goto g;
}
}
void main() {}
clang -O3 -march=arch13 -o a.out -w -mllvm -available-load-scan-limit=12 -mllvm
-disable-cgp-branch-opts -mllvm -verify-machineinstrs
# After Instruction Selection
*** Bad machine code: MBB has duplicate entries in its successor list. ***
- function: e
- basic block: %bb.10 f (0x2aa456acfc8)
or with llc:
define void @e() {
bb:
switch i32 undef, label %bb1 [
i32 0, label %bb2
i32 2, label %bb2
i32 3, label %bb2
]
bb1: ; preds = %bb
br label %bb2
bb2: ; preds = %bb1, %bb, %bb, %bb
ret void
}
llc -mcpu=arch13 -O3 -disable-cgp-branch-opts -verify-machineinstrs
*** Bad machine code: MBB has duplicate entries in its successor list. ***
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