[IndVars] Fix PR24356.
Unsigned predicates increase or decrease agnostic of the signs of their
increments.
llvm-svn: 244265
diff --git a/llvm/test/Transforms/IndVarSimplify/pr24356.ll b/llvm/test/Transforms/IndVarSimplify/pr24356.ll
new file mode 100644
index 0000000..eac4204
--- /dev/null
+++ b/llvm/test/Transforms/IndVarSimplify/pr24356.ll
@@ -0,0 +1,63 @@
+; RUN: opt -S -indvars < %s | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.10.0"
+
+@a = common global i32 0, align 4
+
+; Function Attrs: nounwind ssp uwtable
+define void @fn1() {
+; CHECK-LABEL: @fn1(
+bb:
+ br label %bb4.preheader
+
+bb4.preheader: ; preds = %bb, %bb16
+; CHECK-LABEL: bb4.preheader:
+ %b.03 = phi i8 [ 0, %bb ], [ %tmp17, %bb16 ]
+; CHECK: %tmp9 = icmp ugt i8 %b.03, 1
+; CHECK-NOT: %tmp9 = icmp ugt i8 0, 1
+
+ %tmp9 = icmp ugt i8 %b.03, 1
+ br i1 %tmp9, label %bb4.preheader.bb18.loopexit.split_crit_edge, label %bb4.preheader.bb4.preheader.split_crit_edge
+
+bb4.preheader.bb4.preheader.split_crit_edge: ; preds = %bb4.preheader
+ br label %bb4.preheader.split
+
+bb4.preheader.bb18.loopexit.split_crit_edge: ; preds = %bb4.preheader
+ store i32 0, i32* @a, align 4
+ br label %bb18.loopexit.split
+
+bb4.preheader.split: ; preds = %bb4.preheader.bb4.preheader.split_crit_edge
+ br label %bb7
+
+bb4: ; preds = %bb7
+ %tmp6 = icmp slt i32 %storemerge2, 0
+ br i1 %tmp6, label %bb7, label %bb16
+
+bb7: ; preds = %bb4.preheader.split, %bb4
+ %storemerge2 = phi i32 [ 0, %bb4.preheader.split ], [ %tmp14, %bb4 ]
+ %tmp14 = add nsw i32 %storemerge2, 1
+ br i1 false, label %bb18.loopexit, label %bb4
+
+bb16: ; preds = %bb4
+ %tmp14.lcssa5 = phi i32 [ %tmp14, %bb4 ]
+ %tmp17 = add i8 %b.03, -1
+ %tmp2 = icmp eq i8 %tmp17, -2
+ br i1 %tmp2, label %bb18.loopexit1, label %bb4.preheader
+
+bb18.loopexit: ; preds = %bb7
+ br label %bb18.loopexit.split
+
+bb18.loopexit.split: ; preds = %bb4.preheader.bb18.loopexit.split_crit_edge, %bb18.loopexit
+ br label %bb18
+
+bb18.loopexit1: ; preds = %bb16
+ %tmp14.lcssa5.lcssa = phi i32 [ %tmp14.lcssa5, %bb16 ]
+ store i32 %tmp14.lcssa5.lcssa, i32* @a, align 4
+ br label %bb18
+
+bb18: ; preds = %bb18.loopexit1, %bb18.loopexit.split
+ ret void
+}
+
+declare void @abort()