https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68587
Bug ID: 68587
Summary: [6 Regression][UBSAN] ICE in expand_insn, at
optabs.c:6974
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: burnus at gcc dot gnu.org
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org
Target Milestone: ---
Created attachment 36857
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36857&action=edit
test.ii, compile with: g++ -Ofast -fsanitize=undefined
Very recently, GCC 6 compiled the big program - since today it fails with an
ICE.
Compile the reduced program with:
g++ -Ofast -fsanitize=undefined -S test.ii
It fails here with:
test27.ii: In member function ‘int MSMeasurement::compareWithGrid(const
MSMeasurement&, const ECoordinate&, const ECoordinate&) const’:
test27.ii:128:28: internal compiler error: in expand_insn, at optabs.c:6974
double fa=floor(a/g);
^
0xc2c143 expand_insn(insn_code, unsigned int, expand_operand*)
../../gcc/optabs.c:6974
0xb026a4 expand_direct_optab_fn
../../gcc/internal-fn.c:2147
0x91c69a expand_call_stmt
../../gcc/cfgexpand.c:2565
0x91c69a expand_gimple_stmt_1
../../gcc/cfgexpand.c:3525
0x91c69a expand_gimple_stmt
../../gcc/cfgexpand.c:3688
0x91f25a expand_gimple_basic_block
../../gcc/cfgexpand.c:5694
0x924b46 execute
../../gcc/cfgexpand.c:6309
