https://bugs.llvm.org/show_bug.cgi?id=44366
Bug ID: 44366
Summary: Error when compiling large `if` blocks on
riscv64-linux-gnu
Product: clang
Version: 9.0
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: adrien.sf...@gmail.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
When compiling a program to riscv64-linux-gnu target with large "if" blocks
(which compiles to at least 2^19 bytes of code to make the jump an indirect
branch), clang gives the following error:
error in backend: Unable to insert indirect branch
It seems like a issue on PIE generation, since compiling with --target=riscv64
is successful.
The following is an example source:
int a(int c) {
if (c < 12345) {
#define A \
{ int d = c % 12345; int e = c ^ d * 12345; \
int f = c * d % e % 12345; c = f; }
#define B A A A A A A
#define C B B B B B B
#define D C C C C C C
#define E D D D D D D
E E E E E
}
return c;
}
One can reproduce the error by compiling the source with
clang -O0 --target=riscv64-linux-gnu -c
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