| ; RUN: opt < %s -S -p='newgvn' | FileCheck %s |
| ; MemorySSA should be able to handle a clobber query with an empty MemoryLocation. |
| |
| ; CHECK: @userread |
| define ptr @userread(ptr %p) { |
| entry: |
| br label %loop |
| |
| loop: ; preds = %loop, %entry |
| ; 2 = MemoryPhi({entry,liveOnEntry},{loop,1}) |
| %pos = phi i64 [ 1, %entry ], [ %diff, %loop ] |
| %gep = getelementptr inbounds i8, ptr %p, i64 %pos |
| ; MemoryUse(2) |
| %ld = load ptr, ptr %gep, align 8 |
| ; 1 = MemoryDef(2)->2 |
| %readval = call i64 @fread(ptr noundef nonnull %gep, i64 noundef 1, i64 noundef %pos, ptr noundef %ld) |
| %readvalispos = icmp eq i64 %readval, %pos |
| call void @llvm.assume(i1 %readvalispos) |
| %diff = sub i64 0, %pos |
| br label %loop |
| } |
| |
| declare noundef i64 @fread(ptr nocapture noundef %0, i64 noundef %1, i64 noundef %2, ptr nocapture noundef %3) local_unnamed_addr #0 |
| declare void @llvm.assume(i1 %cond) |
| |
| attributes #0 = { nofree nounwind "frame-pointer"="non-leaf" "no-trapping-math"="true" "prefer-vector-width"="128" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+aes,+cmov,+crc32,+cx16,+cx8,+fxsr,+mmx,+pclmul,+popcnt,+sse,+sse2,+sse3,+sse4.1,+sse4.2,+ssse3,+x87" "tune-cpu"="generic" } |
