https://llvm.org/bugs/show_bug.cgi?id=31887
Bug ID: 31887
Summary: speccpu2000 175.vpr runtime failure when compiled with
LLVM -Ofast x86_64
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: brzy...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
SPECCPU 2000 175.vpr produces the following runtime error:
Error in check_rr_graph: node 2 connects to node 8 2 times.
This only happens with the following configuration: x86_64, -Ofast. The test
is with the reference run dataset and the command line arguments:
./vpr net.in arch.in place.in route.out -nodisp -route_only -route_chan_width
15 -pres_fac_mult 2 -acc_fac 1 -first_iter_pres_fac 4 -initial_pres_fac 8
This error does not happen on aarch64 with -Ofast. Likewise, other optimization
levels -O0, -O1, -O2, -O3 on x86_64 also do not fail.
Using -Ofast -fno-fast-math also runs correctly.
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