https://bugs.llvm.org/show_bug.cgi?id=40799
Bug ID: 40799
Summary: Infinite recursion in getSCEV -> createSCEV
Product: libraries
Version: 6.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Reproduction after creduce:
---
int a, b, c, d, e, f, g;
void h() {
int j = g;
long *k = h;
for (; a;)
;
for (; b; b++) {
c = 0;
for (; c < 7; c++) {
d = 2;
for (; d < 15; d += 2) {
e = 1;
for (; e < 12; e += 2) {
f = 0;
for (; f < 15; f++) {
g = 2;
for (; g < 5; g++)
*k = a ^ 940 * *k * j;
}
}
}
}
}
}
---
Compile with:
clang -w -O2 minimize.c -S
You will see stack trace.
---
#240 0x0000000000cefc70 llvm::ScalarEvolution::createSCEV(llvm::Value*) [clone
.part.1495] (/apps/clang/6.0.0/bin/clang-6.0+0xcefc70)
#241 0x0000000000cf1410 llvm::ScalarEvolution::getSCEV(llvm::Value*)
(/apps/clang/6.0.0/bin/clang-6.0+0xcf1410)
#242 0x0000000000cefc70 llvm::ScalarEvolution::createSCEV(llvm::Value*) [clone
.part.1495] (/apps/clang/6.0.0/bin/clang-6.0+0xcefc70)
#243 0x0000000000cf1410 llvm::ScalarEvolution::getSCEV(llvm::Value*)
(/apps/clang/6.0.0/bin/clang-6.0+0xcf1410)
#244 0x0000000000cefc70 llvm::ScalarEvolution::createSCEV(llvm::Value*) [clone
.part.1495] (/apps/clang/6.0.0/bin/clang-6.0+0xcefc70)
#245 0x0000000000cf1410 llvm::ScalarEvolution::getSCEV(llvm::Value*)
(/apps/clang/6.0.0/bin/clang-6.0+0xcf1410)
#246 0x0000000000cefc70 llvm::ScalarEvolution::createSCEV(llvm::Value*) [clone
.part.1495] (/apps/clang/6.0.0/bin/clang-6.0+0xcefc70)
#247 0x0000000000cf1410 llvm::ScalarEvolution::getSCEV(llvm::Value*)
(/apps/clang/6.0.0/bin/clang-6.0+0xcf1410)
#248 0x0000000000cefc70 llvm::ScalarEvolution::createSCEV(llvm::Value*) [clone
.part.1495] (/apps/clang/6.0.0/bin/clang-6.0+0xcefc70)
#249 0x0000000000cf1410 llvm::ScalarEvolution::getSCEV(llvm::Value*)
(/apps/clang/6.0.0/bin/clang-6.0+0xcf1410)
---
Compiler information:
> clang -v
clang version 6.0.0 (tags/RELEASE_600/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /apps/clang/6.0.0//bin
Found candidate GCC installation: /usr/lib/gcc/i586-suse-linux/2.95.3
Found candidate GCC installation: /usr/lib64/gcc/x86_64-suse-linux/4.3
Selected GCC installation: /usr/lib64/gcc/x86_64-suse-linux/4.3
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
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