392 lines
9.2 KiB
LLVM
392 lines
9.2 KiB
LLVM
; RUN: opt < %s -indvars -S | FileCheck %s
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;
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; Make sure that indvars isn't inserting canonical IVs.
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; This is kinda hard to do until linear function test replacement is removed.
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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define i32 @sum(i32* %arr, i32 %n) nounwind {
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entry:
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%precond = icmp slt i32 0, %n
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br i1 %precond, label %ph, label %return
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ph:
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br label %loop
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; CHECK: loop:
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;
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; We should only have 2 IVs.
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; CHECK: phi
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; CHECK: phi
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; CHECK-NOT: phi
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;
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; sext should be eliminated while preserving gep inboundsness.
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; CHECK-NOT: sext
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; CHECK: getelementptr inbounds
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; CHECK: exit:
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loop:
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%i.02 = phi i32 [ 0, %ph ], [ %iinc, %loop ]
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%s.01 = phi i32 [ 0, %ph ], [ %sinc, %loop ]
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%ofs = sext i32 %i.02 to i64
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%adr = getelementptr inbounds i32* %arr, i64 %ofs
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%val = load i32* %adr
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%sinc = add nsw i32 %s.01, %val
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%iinc = add nsw i32 %i.02, 1
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%cond = icmp slt i32 %iinc, %n
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br i1 %cond, label %loop, label %exit
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exit:
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%s.lcssa = phi i32 [ %sinc, %loop ]
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br label %return
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return:
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%s.0.lcssa = phi i32 [ %s.lcssa, %exit ], [ 0, %entry ]
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ret i32 %s.0.lcssa
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}
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define i64 @suml(i32* %arr, i32 %n) nounwind {
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entry:
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%precond = icmp slt i32 0, %n
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br i1 %precond, label %ph, label %return
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ph:
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br label %loop
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; CHECK: loop:
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;
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; We should only have 2 IVs.
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; CHECK: phi
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; CHECK: phi
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; CHECK-NOT: phi
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;
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; %ofs sext should be eliminated while preserving gep inboundsness.
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; CHECK-NOT: sext
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; CHECK: getelementptr inbounds
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; %vall sext should obviously not be eliminated
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; CHECK: sext
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; CHECK: exit:
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loop:
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%i.02 = phi i32 [ 0, %ph ], [ %iinc, %loop ]
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%s.01 = phi i64 [ 0, %ph ], [ %sinc, %loop ]
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%ofs = sext i32 %i.02 to i64
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%adr = getelementptr inbounds i32* %arr, i64 %ofs
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%val = load i32* %adr
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%vall = sext i32 %val to i64
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%sinc = add nsw i64 %s.01, %vall
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%iinc = add nsw i32 %i.02, 1
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%cond = icmp slt i32 %iinc, %n
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br i1 %cond, label %loop, label %exit
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exit:
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%s.lcssa = phi i64 [ %sinc, %loop ]
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br label %return
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return:
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%s.0.lcssa = phi i64 [ %s.lcssa, %exit ], [ 0, %entry ]
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ret i64 %s.0.lcssa
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}
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define void @outofbounds(i32* %first, i32* %last, i32 %idx) nounwind {
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%precond = icmp ne i32* %first, %last
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br i1 %precond, label %ph, label %return
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; CHECK: ph:
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; It's not indvars' job to perform LICM on %ofs
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; CHECK-NOT: sext
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ph:
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br label %loop
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; CHECK: loop:
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;
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; Preserve exactly one pointer type IV.
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; CHECK: phi i32*
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; CHECK-NOT: phi
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;
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; Don't create any extra adds.
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; CHECK-NOT: add
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;
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; Preserve gep inboundsness, and don't factor it.
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; CHECK: getelementptr inbounds i32* %ptriv, i32 1
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; CHECK-NOT: add
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; CHECK: exit:
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loop:
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%ptriv = phi i32* [ %first, %ph ], [ %ptrpost, %loop ]
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%ofs = sext i32 %idx to i64
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%adr = getelementptr inbounds i32* %ptriv, i64 %ofs
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store i32 3, i32* %adr
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%ptrpost = getelementptr inbounds i32* %ptriv, i32 1
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%cond = icmp ne i32* %ptrpost, %last
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br i1 %cond, label %loop, label %exit
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exit:
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br label %return
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return:
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ret void
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}
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%structI = type { i32 }
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define void @bitcastiv(i32 %start, i32 %limit, i32 %step, %structI* %base)
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nounwind
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{
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entry:
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br label %loop
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; CHECK: loop:
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;
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; Preserve casts
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; CHECK: phi i32
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; CHECK: bitcast
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; CHECK: getelementptr
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; CHECK: exit:
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loop:
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%iv = phi i32 [%start, %entry], [%next, %loop]
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%p = phi %structI* [%base, %entry], [%pinc, %loop]
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%adr = getelementptr %structI* %p, i32 0, i32 0
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store i32 3, i32* %adr
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%pp = bitcast %structI* %p to i32*
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store i32 4, i32* %pp
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%pinc = getelementptr %structI* %p, i32 1
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%next = add i32 %iv, 1
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%cond = icmp ne i32 %next, %limit
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br i1 %cond, label %loop, label %exit
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exit:
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ret void
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}
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define void @maxvisitor(i32 %limit, i32* %base) nounwind {
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entry:
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br label %loop
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; Test inserting a truncate at a phi use.
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;
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; CHECK: loop:
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; CHECK: phi i64
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; CHECK: trunc
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; CHECK: exit:
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loop:
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%idx = phi i32 [ 0, %entry ], [ %idx.next, %loop.inc ]
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%max = phi i32 [ 0, %entry ], [ %max.next, %loop.inc ]
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%idxprom = sext i32 %idx to i64
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%adr = getelementptr inbounds i32* %base, i64 %idxprom
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%val = load i32* %adr
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%cmp19 = icmp sgt i32 %val, %max
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br i1 %cmp19, label %if.then, label %if.else
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if.then:
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br label %loop.inc
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if.else:
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br label %loop.inc
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loop.inc:
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%max.next = phi i32 [ %idx, %if.then ], [ %max, %if.else ]
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%idx.next = add nsw i32 %idx, 1
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%cmp = icmp slt i32 %idx.next, %limit
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br i1 %cmp, label %loop, label %exit
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exit:
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ret void
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}
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define void @identityphi(i32 %limit) nounwind {
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entry:
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br label %loop
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; Test an edge case of removing an identity phi that directly feeds
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; back to the loop iv.
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;
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; CHECK: loop:
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; CHECK-NOT: phi
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; CHECK: exit:
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loop:
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%iv = phi i32 [ 0, %entry], [ %iv.next, %control ]
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br i1 undef, label %if.then, label %control
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if.then:
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br label %control
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control:
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%iv.next = phi i32 [ %iv, %loop ], [ undef, %if.then ]
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%cmp = icmp slt i32 %iv.next, %limit
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br i1 %cmp, label %loop, label %exit
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exit:
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ret void
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}
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define i64 @cloneOr(i32 %limit, i64* %base) nounwind {
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entry:
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; ensure that the loop can't overflow
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%halfLim = ashr i32 %limit, 2
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br label %loop
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; Test cloning an or, which is not an OverflowBinaryOperator.
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;
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; CHECK: loop:
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; CHECK: phi i64
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; CHECK-NOT: sext
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; CHECK: or i64
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; CHECK: exit:
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loop:
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%iv = phi i32 [ 0, %entry], [ %iv.next, %loop ]
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%t1 = sext i32 %iv to i64
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%adr = getelementptr i64* %base, i64 %t1
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%val = load i64* %adr
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%t2 = or i32 %iv, 1
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%t3 = sext i32 %t2 to i64
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%iv.next = add i32 %iv, 2
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%cmp = icmp slt i32 %iv.next, %halfLim
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br i1 %cmp, label %loop, label %exit
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exit:
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%result = and i64 %val, %t3
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ret i64 %result
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}
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; The i induction variable looks like a wrap-around, but it really is just
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; a simple affine IV. Make sure that indvars simplifies through.
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define i32 @indirectRecurrence() nounwind {
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entry:
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br label %loop
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; ReplaceLoopExitValue should fold the return value to constant 9.
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; CHECK: loop:
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; CHECK: phi i32
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; CHECK: ret i32 9
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loop:
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%j.0 = phi i32 [ 1, %entry ], [ %j.next, %cond_true ]
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%i.0 = phi i32 [ 0, %entry ], [ %j.0, %cond_true ]
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%tmp = icmp ne i32 %j.0, 10
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br i1 %tmp, label %cond_true, label %return
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cond_true:
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%j.next = add i32 %j.0, 1
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br label %loop
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return:
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ret i32 %i.0
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}
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; Eliminate the congruent phis j, k, and l.
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; Eliminate the redundant IV increments k.next and l.next.
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; Two phis should remain, one starting at %init, and one at %init1.
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; Two increments should remain, one by %step and one by %step1.
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; CHECK: loop:
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; CHECK: phi i32
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; CHECK: phi i32
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; CHECK-NOT: phi
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; CHECK: add i32
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; CHECK: add i32
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; CHECK: add i32
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; CHECK-NOT: add
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; CHECK: return:
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;
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; Five live-outs should remain.
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; CHECK: lcssa = phi
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; CHECK: lcssa = phi
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; CHECK: lcssa = phi
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; CHECK: lcssa = phi
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; CHECK: lcssa = phi
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; CHECK-NOT: phi
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; CHECK: ret
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define i32 @isomorphic(i32 %init, i32 %step, i32 %lim) nounwind {
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entry:
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%step1 = add i32 %step, 1
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%init1 = add i32 %init, %step1
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%l.0 = sub i32 %init1, %step1
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br label %loop
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loop:
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%ii = phi i32 [ %init1, %entry ], [ %ii.next, %loop ]
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%i = phi i32 [ %init, %entry ], [ %ii, %loop ]
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%j = phi i32 [ %init, %entry ], [ %j.next, %loop ]
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%k = phi i32 [ %init1, %entry ], [ %k.next, %loop ]
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%l = phi i32 [ %l.0, %entry ], [ %l.next, %loop ]
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%ii.next = add i32 %ii, %step1
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%j.next = add i32 %j, %step1
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%k.next = add i32 %k, %step1
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%l.step = add i32 %l, %step
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%l.next = add i32 %l.step, 1
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%cmp = icmp ne i32 %ii.next, %lim
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br i1 %cmp, label %loop, label %return
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return:
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%sum1 = add i32 %i, %j.next
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%sum2 = add i32 %sum1, %k.next
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%sum3 = add i32 %sum1, %l.step
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%sum4 = add i32 %sum1, %l.next
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ret i32 %sum4
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}
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; Test a GEP IV that is derived from another GEP IV by a nop gep that
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; lowers the type without changing the expression.
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%structIF = type { i32, float }
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define void @congruentgepiv(%structIF* %base) nounwind uwtable ssp {
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entry:
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%first = getelementptr inbounds %structIF* %base, i64 0, i32 0
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br label %loop
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; CHECK: loop:
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; CHECK: phi %structIF*
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; CHECK-NOT: phi
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; CHECK: getelementptr inbounds
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; CHECK-NOT: getelementptr
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; CHECK: exit:
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loop:
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%ptr.iv = phi %structIF* [ %ptr.inc, %latch ], [ %base, %entry ]
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%next = phi i32* [ %next.inc, %latch ], [ %first, %entry ]
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store i32 4, i32* %next
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br i1 undef, label %latch, label %exit
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latch: ; preds = %for.inc50.i
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%ptr.inc = getelementptr inbounds %structIF* %ptr.iv, i64 1
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%next.inc = getelementptr inbounds %structIF* %ptr.inc, i64 0, i32 0
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br label %loop
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exit:
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ret void
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}
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; Test a widened IV that is used by a phi on different paths within the loop.
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;
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; CHECK: for.body:
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; CHECK: phi i64
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; CHECK: trunc i64
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; CHECK: if.then:
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; CHECK: for.inc:
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; CHECK: phi i32
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; CHECK: for.end:
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define void @phiUsesTrunc() nounwind {
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entry:
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br i1 undef, label %for.body, label %for.end
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for.body:
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%iv = phi i32 [ %inc, %for.inc ], [ 1, %entry ]
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br i1 undef, label %if.then, label %if.else
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if.then:
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br i1 undef, label %if.then33, label %for.inc
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if.then33:
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br label %for.inc
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if.else:
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br i1 undef, label %if.then97, label %for.inc
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if.then97:
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%idxprom100 = sext i32 %iv to i64
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br label %for.inc
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for.inc:
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%kmin.1 = phi i32 [ %iv, %if.then33 ], [ 0, %if.then ], [ %iv, %if.then97 ], [ 0, %if.else ]
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%inc = add nsw i32 %iv, 1
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br i1 undef, 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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