26 lines
1.2 KiB
LLVM
26 lines
1.2 KiB
LLVM
; RUN: opt < %s -S -p='newgvn' | FileCheck %s
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; MemorySSA should be able to handle a clobber query with an empty MemoryLocation.
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; CHECK: @userread
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define ptr @userread(ptr %p) {
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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; 2 = MemoryPhi({entry,liveOnEntry},{loop,1})
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%pos = phi i64 [ 1, %entry ], [ %diff, %loop ]
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%gep = getelementptr inbounds i8, ptr %p, i64 %pos
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; MemoryUse(2)
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%ld = load ptr, ptr %gep, align 8
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; 1 = MemoryDef(2)->2
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%readval = call i64 @fread(ptr noundef nonnull %gep, i64 noundef 1, i64 noundef %pos, ptr noundef %ld)
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%readvalispos = icmp eq i64 %readval, %pos
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call void @llvm.assume(i1 %readvalispos)
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%diff = sub i64 0, %pos
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br label %loop
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}
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declare noundef i64 @fread(ptr nocapture noundef %0, i64 noundef %1, i64 noundef %2, ptr nocapture noundef %3) local_unnamed_addr #0
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declare void @llvm.assume(i1 %cond)
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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" }
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