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c0f2b8b528
LinearFunctionTestReplace tries to use the *next* indvar to compare against when possible. However, it may be the case that the calculation for the next indvar has NUW/NSW flags and that it may only be safely used inside the loop. Using it in a comparison to calculate the exit condition could result in observing poison. This fixes PR20680. Differential Revision: http://reviews.llvm.org/D5174 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217102 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
2.4 KiB
LLVM
70 lines
2.4 KiB
LLVM
; RUN: opt -S -indvars -o - %s | FileCheck %s
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target datalayout = "e-p:32:32:32-p1:64:64:64-p2:8:8:8-p3:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32-n8:16:32:64"
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; Derived from ptriv in lftr-reuse.ll
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define void @ptriv_as2(i8 addrspace(2)* %base, i32 %n) nounwind {
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; CHECK-LABEL: @ptriv_as2(
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entry:
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%idx.trunc = trunc i32 %n to i8
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%add.ptr = getelementptr inbounds i8 addrspace(2)* %base, i8 %idx.trunc
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%cmp1 = icmp ult i8 addrspace(2)* %base, %add.ptr
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br i1 %cmp1, label %for.body, label %for.end
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; Make sure the added GEP has the right index type
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; CHECK: %lftr.limit = getelementptr i8 addrspace(2)* %base, i8
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; CHECK: for.body:
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; CHECK: phi i8 addrspace(2)*
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; CHECK-NOT: phi
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; CHECK-NOT: add{{^rspace}}
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; CHECK: icmp ne i8 addrspace(2)*
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; CHECK: br i1
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for.body:
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%p.02 = phi i8 addrspace(2)* [ %base, %entry ], [ %incdec.ptr, %for.body ]
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; cruft to make the IV useful
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%sub.ptr.lhs.cast = ptrtoint i8 addrspace(2)* %p.02 to i8
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%sub.ptr.rhs.cast = ptrtoint i8 addrspace(2)* %base to i8
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%sub.ptr.sub = sub i8 %sub.ptr.lhs.cast, %sub.ptr.rhs.cast
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store i8 %sub.ptr.sub, i8 addrspace(2)* %p.02
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%incdec.ptr = getelementptr inbounds i8 addrspace(2)* %p.02, i32 1
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%cmp = icmp ult i8 addrspace(2)* %incdec.ptr, %add.ptr
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br i1 %cmp, label %for.body, label %for.end
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for.end:
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ret void
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}
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define void @ptriv_as3(i8 addrspace(3)* %base, i32 %n) nounwind {
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; CHECK-LABEL: @ptriv_as3(
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entry:
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%idx.trunc = trunc i32 %n to i16
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%add.ptr = getelementptr inbounds i8 addrspace(3)* %base, i16 %idx.trunc
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%cmp1 = icmp ult i8 addrspace(3)* %base, %add.ptr
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br i1 %cmp1, label %for.body, label %for.end
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; Make sure the added GEP has the right index type
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; CHECK: %lftr.limit = getelementptr i8 addrspace(3)* %base, i16
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; CHECK: for.body:
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; CHECK: phi i8 addrspace(3)*
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; CHECK-NOT: phi
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; CHECK-NOT: add{{^rspace}}
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; CHECK: icmp ne i8 addrspace(3)*
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; CHECK: br i1
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for.body:
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%p.02 = phi i8 addrspace(3)* [ %base, %entry ], [ %incdec.ptr, %for.body ]
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; cruft to make the IV useful
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%sub.ptr.lhs.cast = ptrtoint i8 addrspace(3)* %p.02 to i16
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%sub.ptr.rhs.cast = ptrtoint i8 addrspace(3)* %base to i16
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%sub.ptr.sub = sub i16 %sub.ptr.lhs.cast, %sub.ptr.rhs.cast
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%conv = trunc i16 %sub.ptr.sub to i8
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store i8 %conv, i8 addrspace(3)* %p.02
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%incdec.ptr = getelementptr inbounds i8 addrspace(3)* %p.02, i32 1
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%cmp = icmp ult i8 addrspace(3)* %incdec.ptr, %add.ptr
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br i1 %cmp, label %for.body, label %for.end
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for.end:
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ret void
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}
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