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b20b7d2ec2
testing for dereferenceable pointers into a helper function, isDereferenceablePointer. Teach it how to reason about GEPs with simple non-zero indices. Also eliminate ArgumentPromtion's IsAlwaysValidPointer, which didn't check for weak externals or out of range gep indices. llvm-svn: 118840
95 lines
2.6 KiB
LLVM
95 lines
2.6 KiB
LLVM
; RUN: opt -simplifycfg -S < %s | FileCheck %s
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; This load is safe to speculate, as it's from a safe offset
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; within an alloca.
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; CHECK: @yes
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; CHECK-NOT: br
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define void @yes(i1 %c) nounwind {
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entry:
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%a = alloca [4 x i64*], align 8
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%__a.addr = getelementptr [4 x i64*]* %a, i64 0, i64 3
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call void @frob(i64** %__a.addr)
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br i1 %c, label %if.then, label %if.end
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if.then: ; preds = %entry
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br label %return
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if.end: ; preds = %entry
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%tmp5 = load i64** %__a.addr, align 8
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br label %return
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return: ; preds = %if.end, %if.then
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%storemerge = phi i64* [ undef, %if.then ], [ %tmp5, %if.end ]
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ret void
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}
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; CHECK: @no0
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; CHECK: br i1 %c
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define void @no0(i1 %c) nounwind {
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entry:
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%a = alloca [4 x i64*], align 8
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%__a.addr = getelementptr [4 x i64*]* %a, i64 0, i64 4
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call void @frob(i64** %__a.addr)
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br i1 %c, label %if.then, label %if.end
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if.then: ; preds = %entry
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br label %return
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if.end: ; preds = %entry
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%tmp5 = load i64** %__a.addr, align 8
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br label %return
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return: ; preds = %if.end, %if.then
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%storemerge = phi i64* [ undef, %if.then ], [ %tmp5, %if.end ]
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ret void
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}
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; CHECK: @no1
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; CHECK: br i1 %c
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define void @no1(i1 %c, i64 %n) nounwind {
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entry:
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%a = alloca [4 x i64*], align 8
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%__a.addr = getelementptr [4 x i64*]* %a, i64 0, i64 %n
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call void @frob(i64** %__a.addr)
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br i1 %c, label %if.then, label %if.end
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if.then: ; preds = %entry
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br label %return
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if.end: ; preds = %entry
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%tmp5 = load i64** %__a.addr, align 8
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br label %return
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return: ; preds = %if.end, %if.then
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%storemerge = phi i64* [ undef, %if.then ], [ %tmp5, %if.end ]
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ret void
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}
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; CHECK: @no2
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; CHECK: br i1 %c
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define void @no2(i1 %c, i64 %n) nounwind {
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entry:
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%a = alloca [4 x i64*], align 8
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%__a.addr = getelementptr [4 x i64*]* %a, i64 1, i64 0
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call void @frob(i64** %__a.addr)
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br i1 %c, label %if.then, label %if.end
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if.then: ; preds = %entry
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br label %return
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if.end: ; preds = %entry
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%tmp5 = load i64** %__a.addr, align 8
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br label %return
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return: ; preds = %if.end, %if.then
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%storemerge = phi i64* [ undef, %if.then ], [ %tmp5, %if.end ]
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ret void
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}
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declare void @frob(i64** nocapture %p)
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