http://llvm.org/bugs/show_bug.cgi?id=22552
Bug ID: 22552
Summary: Backend fails at __builtin_ia32_rdrand32_step, if
driver is missing -mrdrnd
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
This seems more like a bug than QoI issue. Given:
int /*__attribute__((target("randr")))*/ f() {
unsigned int v;
__builtin_ia32_rdrand32_step(&v);
return v;
}
Without -mrdrnd, clang exits with code 70.
fatal error: error in backend: Cannot select: 0x63a57d0: i32,glue,ch =
X86ISD::RDRAND 0x636c0d0 [ORD=2] [ID=5]
In function: _Z1fv
clang-3.7: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
With -mrdrnd, works as expected.
% clang -c -o randr.o randr.cpp -mrdrnd && echo $?
0
Perhaps, we can warn/error about about missing features.
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