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