https://bugs.llvm.org/show_bug.cgi?id=39890
Bug ID: 39890
Summary: New assertion failure `MustInsert.second && "New
discriminator shouldn't be present in set"'
(X86DiscriminateMemOps.cpp)
Product: new-bugs
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: greg.bedw...@sony.com
CC: davi...@google.com, htmldevelo...@gmail.com,
llvm-bugs@lists.llvm.org, w...@google.com
Bisected on our internal fork to r347938 (Revert "Revert r347596 "Support for
inserting profile-directed cache prefetches") but reproducible with upstream
TOT (r348340) as follows:
$ cat 1.cpp
# define B4 b; b; b; b
# define B16 B4; B4; B4; B4
# define B64 B16; B16; B16; B16
# define B256 B64; B64; B64; B64
# define B1024 B256; B256; B256; B256
void a() {
volatile int b;
B1024; B1024; B;
}
$ ./bin/clang 1.cpp -c --target=x86_64-unknown-unknown -g
-fdebug-info-for-profiling -DB=
$ ./bin/clang 1.cpp -c --target=x86_64-unknown-unknown -g
-fdebug-info-for-profiling -DB=b
clang-8:
/mnt/e/work/public-git/llvm-project/llvm/lib/Target/X86/X86DiscriminateMemOps.cpp:119:
virtual bool
{anonymous}::X86DiscriminateMemOps::runOnMachineFunction(llvm::MachineFunction&):
Assertion `MustInsert.second && "New discriminator shouldn't be present in
set"' failed.
Obviously the above is quite a contrived testcase but we've seen it happen in
real code where there is heavy use of nested macro expansions.
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