Floating Point Exception in remNode

[clesmian]

While fuzzing commit a1fc328 compiled without ASAN I found the following file to crash the compiler with a floating point exception:

process=6000000000e0%-1;

A subsequent build of the same commit with ASAN lead to the following ASAN output:

AddressSanitizer:DEADLYSIGNAL
=================================================================
==597244==ERROR: AddressSanitizer: FPE on unknown address 0x564c70e85e86 (pc 0x564c70e85e86 bp 0x7f7c3f8f7e80 sp 0x7f7c3f8f7be0 T1)
    #0 0x564c70e85e85 in remNode(Node const&, Node const&) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x96ae85)
    #1 0x564c70dd5cec in BinOp::compute(Node const&, Node const&) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x8bacec)
    #2 0x564c70dc6377 in simplification(CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x8ab377)
    #3 0x564c70dc5921 in traced_simplification(CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x8aa921)
    #4 0x564c70dc79a5 in sigMap(CTree*, CTree* (*)(CTree*), CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x8ac9a5)
    #5 0x564c70dc5b9a in simplify(CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x8aab9a)
    #6 0x564c70e61a77 in realPropagate(CTree*, CTree*, CTree*, std::vector<CTree*, std::allocator<CTree*> > const&) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x946a77)
    #7 0x564c70e68461 in propagate(CTree*, CTree*, CTree*, std::vector<CTree*, std::allocator<CTree*> > const&) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x94d461)
    #8 0x564c70e68910 in boxPropagateSig(CTree*, CTree*, std::vector<CTree*, std::allocator<CTree*> > const&) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x94d910)
    #9 0x564c7093137c in realeval(CTree*, CTree*, CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x41637c)
    #10 0x564c709304ba in eval(CTree*, CTree*, CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x4154ba)
    #11 0x564c7093430a in realeval(CTree*, CTree*, CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x41930a)
    #12 0x564c709304ba in eval(CTree*, CTree*, CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x4154ba)
    #13 0x564c7093c20f in evalIdDef(CTree*, CTree*, CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x42120f)
    #14 0x564c70933cce in realeval(CTree*, CTree*, CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x418cce)
    #15 0x564c709304ba in eval(CTree*, CTree*, CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x4154ba)
    #16 0x564c7092e902 in evalprocess(CTree*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x413902)
    #17 0x564c70d618c6 in evaluateBlockDiagram(CTree*, int&, int&) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x8468c6)
    #18 0x564c70d6866c in createFactoryAux1(void*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x84d66c)
    #19 0x7f7c431e9608 in start_thread /build/glibc-SzIz7B/glibc-2.31/nptl/pthread_create.c:477
    #20 0x7f7c42dc0132 in __clone (/lib/x86_64-linux-gnu/libc.so.6+0x11f132)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: FPE (/home/clesmian/targets/faust/bin-latest-asan/faust+0x96ae85) in remNode(Node const&, Node const&)
Thread T1 created by T0 here:
    #0 0x7f7c4323e815 in __interceptor_pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cc:208
    #1 0x564c70ce3d58 in callFun(void* (*)(void*), void*) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x7c8d58)
    #2 0x564c70d69dd7 in createFactory(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int, char const**, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, bool) (/home/clesmian/targets/faust/bin-latest-asan/faust+0x84edd7)
    #3 0x564c70d79d49 in main (/home/clesmian/targets/faust/bin-latest-asan/faust+0x85ed49)
    #4 0x7f7c42cc5082 in __libc_start_main ../csu/libc-start.c:308

==597244==ABORTING