Broaden an assert to handle enable-iv-rewrite=true following r143183.

Narrowest possible fix for PR11279.

llvm-svn: 143522

llvm/lib/Transforms/Scalar/IndVarSimplify.cpp

@@ -1588,7 +1588,7 @@ LinearFunctionTestReplace(Loop *L,
 
   assert(SE->isLoopInvariant(IVLimit, L) &&
          "Computed iteration count is not loop invariant!");
-  assert( !IVLimit->getType()->isPointerTy() &&
+  assert( EnableIVRewrite || !IVLimit->getType()->isPointerTy() &&
           "Should not expand pointer types" );
   Value *ExitCnt = Rewriter.expandCodeFor(IVLimit, CmpTy, BI);
 

llvm/test/Transforms/IndVarSimplify/2011-11-01-lftrptr.ll

@@ -0,0 +1,38 @@
+; RUN: opt < %s -indvars -S -enable-iv-rewrite=true | FileCheck %s
+;
+; PR11279: Assertion !IVLimit->getType()->isPointerTy()
+;
+; Test a non-integer BECount. It doesn't make sense, but that's what
+; falls out of SCEV. Since it's an i8*, we never adjust in a way that
+; would convert it to an integer type.
+;
+; enable-iv-rewrite=false does not currently perform LFTR when the the
+; taken count is a pointer expression, but that will change son.
+
+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"
+target triple = "x86_64-apple-darwin"
+
+; CHECK: @test8
+; CHECK: loop:
+; CHECK: icmp ne
+define i8 @test8(i8* %buf, i8* %end) nounwind {
+  br label %loopguard
+
+loopguard:
+  %guard = icmp ult i8* %buf, %end
+  br i1 %guard, label %preheader, label %exit
+
+preheader:
+  br label %loop
+
+loop:
+  %p.01.us.us = phi i8* [ %buf, %preheader ], [ %gep, %loop ]
+  %s = phi i8 [0, %preheader], [%snext, %loop]
+  %gep = getelementptr inbounds i8* %p.01.us.us, i64 1
+  %snext = load i8* %gep
+  %cmp = icmp ult i8* %gep, %end
+  br i1 %cmp, label %loop, label %exit
+
+exit:
+  ret i8 %snext
+}