Renable r314928
Eliminate inttype phi with inttoptr/ptrtoint.
This version fixed a bug in finding the matching
phi -- the order of the incoming blocks may be
different (triggered in self build on Windows).
A new test case is added.
llvm-svn: 315272
diff --git a/llvm/test/Transforms/InstCombine/intptr3.ll b/llvm/test/Transforms/InstCombine/intptr3.ll
new file mode 100644
index 0000000..72b81ce
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/intptr3.ll
@@ -0,0 +1,39 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define void @test(float* %a, float* readnone %a_end, i64 %b) unnamed_addr {
+entry:
+ %cmp1 = icmp ult float* %a, %a_end
+ br i1 %cmp1, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ %b.float = inttoptr i64 %b to float*
+ br label %for.body
+
+for.body: ; preds = %for.body.preheader, %for.body
+ %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+ %b.addr.float = phi float* [ %b.addr.float.inc, %for.body ], [ %b.float, %for.body.preheader ]
+ %b.addr.i64 = phi i64 [ %b.addr.i64.inc, %for.body ], [ %b, %for.body.preheader ]
+; CHECK: %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+; CHECK-NEXT: %b.addr.float = phi float* [ %b.addr.float.inc, %for.body ], [ %b.float, %for.body.preheader ]
+; CHECK-NEXT: = load float
+ %l = load float, float* %b.addr.float, align 4
+ %mul.i = fmul float %l, 4.200000e+01
+ store float %mul.i, float* %a.addr.03, align 4
+; CHECK: store float
+ %b.addr.float.2 = inttoptr i64 %b.addr.i64 to float*
+; CHECK-NOT: inttoptr
+ %b.addr.float.inc = getelementptr inbounds float, float* %b.addr.float.2, i64 1
+; CHECK: %b.addr.float.inc =
+ %b.addr.i64.inc = ptrtoint float* %b.addr.float.inc to i64
+; CHECK-NOT: ptrtoint
+ %incdec.ptr = getelementptr inbounds float, float* %a.addr.03, i64 1
+; CHECK: %incdec.ptr =
+ %cmp = icmp ult float* %incdec.ptr, %a_end
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.body, %entry
+ ret void
+}
+
+
+