https://bugs.llvm.org/show_bug.cgi?id=48761
Bug ID: 48761
Summary: [Machine Block Placement] wrong code with
-force-loop-cold-block
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 24382
--> https://bugs.llvm.org/attachment.cgi?id=24382&action=edit
reduced testcase
This program should execute the inner loop in c() once and therefore print '5'.
volatile int a = 0, b = 1;
void c() {
for (; b < 2; b++)
for (; a < 5; a++)
;
}
int main() {
c();
printf("%d\n", a);
}
However, with -force-loop-cold-block, it prints 0, because it moves the outer
latch up to before the outer loop, increments b first, and then directly exits
since b is now 2...
llc -mcpu=arch13 tc.mir -run-pass=block-placement -force-loop-cold-block
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