1 files changed, 53 insertions, 0 deletions
diff --git a/test/Analysis/ScalarEvolution/min-max-exprs.ll b/test/Analysis/ScalarEvolution/min-max-exprs.ll
new file mode 100644
index 0000000..3e0a35d
--- /dev/null
+++ b/test/Analysis/ScalarEvolution/min-max-exprs.ll
@@ -0,0 +1,53 @@
+; RUN: opt -scalar-evolution -analyze < %s | FileCheck %s
+;
+; This checks if the min and max expressions are properly recognized by
+; ScalarEvolution even though they the ICmpInst and SelectInst have different
+; types.
+;
+;    #define max(a, b) (a > b ? a : b)
+;    #define min(a, b) (a < b ? a : b)
+;
+;    void f(int *A, int N) {
+;      for (int i = 0; i < N; i++) {
+;        A[max(0, i - 3)] = A[min(N, i + 3)] * 2;
+;      }
+;    }
+;
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @f(i32* %A, i32 %N) {
+bb:
+  br label %bb1
+
+bb1:                                              ; preds = %bb2, %bb
+  %i.0 = phi i32 [ 0, %bb ], [ %tmp23, %bb2 ]
+  %i.0.1 = sext i32 %i.0 to i64
+  %tmp = icmp slt i32 %i.0, %N
+  br i1 %tmp, label %bb2, label %bb24
+
+bb2:                                              ; preds = %bb1
+  %tmp3 = add nuw nsw i32 %i.0, 3
+  %tmp4 = icmp slt i32 %tmp3, %N
+  %tmp5 = sext i32 %tmp3 to i64
+  %tmp6 = sext i32 %N to i64
+  %tmp9 = select i1 %tmp4, i64 %tmp5, i64 %tmp6
+;                  min(N, i+3)
+; CHECK:           select i1 %tmp4, i64 %tmp5, i64 %tmp6
+; CHECK-NEXT:  --> (-1 + (-1 * ((-1 + (-1 * (sext i32 {3,+,1}<nw><%bb1> to i64))) smax (-1 + (-1 * (sext i32 %N to i64))))))
+  %tmp11 = getelementptr inbounds i32* %A, i64 %tmp9
+  %tmp12 = load i32* %tmp11, align 4
+  %tmp13 = shl nsw i32 %tmp12, 1
+  %tmp14 = icmp sge i32 3, %i.0
+  %tmp17 = add nsw i64 %i.0.1, -3
+  %tmp19 = select i1 %tmp14, i64 0, i64 %tmp17
+;                  max(0, i - 3)
+; CHECK:           select i1 %tmp14, i64 0, i64 %tmp17
+; CHECK-NEXT: -->  (-3 + (3 smax {0,+,1}<nuw><nsw><%bb1>))
+  %tmp21 = getelementptr inbounds i32* %A, i64 %tmp19
+  store i32 %tmp13, i32* %tmp21, align 4
+  %tmp23 = add nuw nsw i32 %i.0, 1
+  br label %bb1
+
+bb24:                                             ; preds = %bb1
+  ret void
+}