https://bugs.llvm.org/show_bug.cgi?id=52507
Bug ID: 52507
Summary: Possible missing libm functions, ICE on reproducible
Product: OpenMP
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Clang Compiler Support
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Test case reported by Wael Elwasif,
#include <omp.h>
#include <math.h>
#include <cstdio>
int main(int argc, char **argv){
float a = 1.5;
#pragma omp target map(tofrom: a)
{
a = floor(a);
}
printf("a = %lf\n", a);
}
Reported failure mode:
clang++ -std=c++17 -lm -O3 -fopenmp -target x86_64-pc-linux-gnu
-fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa
-march=gfx90a ./test_cmath.cpp
lld: error: undefined symbol: floorf
where changing the call to floorf, or the type to double, links OK.
However, on attempting to reproduce this, I get a segv on trunk:
https://godbolt.org/z/azsvd84fn
#3 0x0000558c2e2f6ff6 (anonymous
namespace)::AAKernelInfoFunction::changeToSPMDMode(llvm::Attributor&,
llvm::ChangeStatus&) (.constprop.1276) OpenMPOpt.cpp:0:0
#4 0x0000558c2e2f7de7 (anonymous
namespace)::AAKernelInfoFunction::manifest(llvm::Attributor&) OpenMPOpt.cpp:0:0
#5 0x0000558c2e22181c llvm::Attributor::manifestAttributes()
(/opt/compiler-explorer/clang-trunk-20211115/bin/clang-14+0x2c2181c)
#6 0x0000558c2e22d61b llvm::Attributor::run()
(/opt/compiler-explorer/clang-trunk-20211115/bin/clang-14+0x2c2d61b)
#7 0x0000558c2e300ec8 (anonymous namespace)::OpenMPOpt::runAttributor(bool)
(.part.1214) OpenMPOpt.cpp:0:0
#8 0x0000558c2e301531 (anonymous namespace)::OpenMPOpt::run(bool)
OpenMPOpt.cpp:0:0
#9 0x0000558c2e3044d7 llvm::OpenMPOptPass::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/opt/compiler-explorer/clang-trunk-20211115/bin/clang-14+0x2d044d7)
Bug was reported to me ~3 days ago.
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