| Issue |
63851
|
| Summary |
memcpyopt fails with Assertion `Parent == Other->Parent && "cross-BB instruction order comparison"' failed.
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
serge-sans-paille
|
While compiling firefox with clang from 253a52988fe37887ba1f7741271d602083fe7dd7 , I hit an assert.
The following (reduced) test case fails on `opt '-passes=early-cse,memcpyopt' -S cross-block.ll` where `cross-block.ll` contains
```llvm
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
define void @test_case(ptr %this, ptr %aFrame, i1 %call14) unnamed_addr {
entry:
%r = alloca %struct.nsRect
%ref.tmp18 = alloca %struct.nsRect
%x = getelementptr inbounds %struct.nsRect, ptr %r, i32 0, i32 0
store i32 0, ptr %x
br i1 %call14, label %if.then17, label %if.end21
if.then17:
call void @fwd_decl(ptr %ref.tmp18, ptr %r)
call void @llvm.memcpy.p0.p0.i64(ptr %r, ptr %ref.tmp18, i64 16, i1 false)
br label %if.end21
if.end21:
ret void
}
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg)
declare hidden void @fwd_decl(ptr, ptr )
```
I couldn't remove the `ealy-cse` pass :-/
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