https://bugs.llvm.org/show_bug.cgi?id=44344
Bug ID: 44344
Summary: Machine outliner runs out of stack space analyzing
large sequences
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]
Discussed in https://reviews.llvm.org/D66210, this bug occurs when running the
following testcase with machine outlining enabled for RISC-V (command used to
run: 'riscv32-unknown-elf-clang -O -c -mllvm -enable-machine-outliner'):
/* PR rtl-optimization/48141 */
/* { dg-do compile } */
/* { dg-options "-O" } */
#define A i = 0;
#define B A A A A A A A A A A
#define C B B B B B B B B B B
#define D C C C C C C C C C C
#define E D D D D D D D D D D
int
foo (void)
{
volatile int i = 0;
E E E E E E E E E E E
return 0;
}
This fails with a segmentation fault from within the function
'setSuffixIndices'. Valgrind reports that after a large amount of recursive
calls of this function the program runs out of stack memory.
I have attempted to reproduce this bug for X86 or AArch64 but due to some of
the target-specific restrictions on what instructions can be outlined I found
it intractable to create a simple testcase. However by temporarily modifying
those restrictions within the compiler I can indeed reproduce this segmentation
fault.
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