Florian Hahn 51ff04567b Recommit "[DSE] Switch to MemorySSA-backed DSE by default."
After investigation by @asbirlea, the issue that caused the
revert appears to be an issue in the original source, rather
than a problem with the compiler.

This patch enables MemorySSA DSE again.

This reverts commit 915310bf14cbac58a81fd60e0fa9dc8d341108e2.
2020-10-16 09:02:53 +01:00

26 lines
499 B
LLVM

; RUN: opt -dse -disable-output < %s
; test that we don't crash
declare void @bar()
define void @foo() {
bb1:
%memtmp3.i = alloca [21 x i8], align 1
%0 = getelementptr inbounds [21 x i8], [21 x i8]* %memtmp3.i, i64 0, i64 0
br label %bb3
bb2:
call void @llvm.lifetime.end.p0i8(i64 -1, i8* %0)
br label %bb3
bb3:
call void @bar()
call void @llvm.lifetime.end.p0i8(i64 -1, i8* %0)
br label %bb4
bb4:
ret void
}
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) nounwind