1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4 2; RUN: opt < %s -S -p='newgvn' | FileCheck %s 3; 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 8 14; 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 %loop 22 23loop: ; preds = %loop, %entry 24; 2 = MemoryPhi({entry,liveOnEntry},{loop,1}) 25 %pos = phi i64 [ 1, %entry ], [ %diff, %loop ] 26 %gep = getelementptr inbounds i8, ptr %p, i64 %pos 27; MemoryUse(2) 28 %ld = load ptr, ptr %gep, align 8 29; 1 = MemoryDef(2)->2 30 %readval = call i64 @fread(ptr noundef nonnull %gep, i64 noundef 1, i64 noundef %pos, ptr noundef %ld) 31 %readvalispos = icmp eq i64 %readval, %pos 32 call void @llvm.assume(i1 %readvalispos) 33 %diff = sub i64 0, %pos 34 br label %loop 35} 36 37declare noundef i64 @fread(ptr nocapture noundef %0, i64 noundef %1, i64 noundef %2, ptr nocapture noundef %3) local_unnamed_addr #0 38declare 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