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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 42; RUN: opt < %s -S -p='newgvn' | FileCheck %s3; MemorySSA should be able to handle a clobber query with an empty MemoryLocation.4 5define ptr @userread(ptr %p) {6; CHECK-LABEL: define ptr @userread(7; CHECK-SAME: ptr [[P:%.*]]) {8; CHECK-NEXT: entry:9; CHECK-NEXT: br label [[LOOP:%.*]]10; CHECK: loop:11; CHECK-NEXT: [[POS:%.*]] = phi i64 [ 1, [[ENTRY:%.*]] ], [ [[DIFF:%.*]], [[LOOP]] ]12; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, ptr [[P]], i64 [[POS]]13; CHECK-NEXT: [[LD:%.*]] = load ptr, ptr [[GEP]], align 814; CHECK-NEXT: [[READVAL:%.*]] = call i64 @fread(ptr noundef nonnull [[GEP]], i64 noundef 1, i64 noundef [[POS]], ptr noundef [[LD]])15; CHECK-NEXT: [[READVALISPOS:%.*]] = icmp eq i64 [[READVAL]], [[POS]]16; CHECK-NEXT: call void @llvm.assume(i1 [[READVALISPOS]])17; CHECK-NEXT: [[DIFF]] = sub i64 0, [[POS]]18; CHECK-NEXT: br label [[LOOP]]19;20entry:21 br label %loop22 23loop: ; preds = %loop, %entry24; 2 = MemoryPhi({entry,liveOnEntry},{loop,1})25 %pos = phi i64 [ 1, %entry ], [ %diff, %loop ]26 %gep = getelementptr inbounds i8, ptr %p, i64 %pos27; MemoryUse(2)28 %ld = load ptr, ptr %gep, align 829; 1 = MemoryDef(2)->230 %readval = call i64 @fread(ptr noundef nonnull %gep, i64 noundef 1, i64 noundef %pos, ptr noundef %ld)31 %readvalispos = icmp eq i64 %readval, %pos32 call void @llvm.assume(i1 %readvalispos)33 %diff = sub i64 0, %pos34 br label %loop35}36 37declare noundef i64 @fread(ptr nocapture noundef %0, i64 noundef %1, i64 noundef %2, ptr nocapture noundef %3) local_unnamed_addr #038declare void @llvm.assume(i1 %cond)39 40attributes #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" }41