Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Transforms/IndVarSimplify/variable-stride-ivs-1.ll

@@ -0,0 +1,43 @@
+; RUN: opt < %s -indvars
+; PR4315
+
+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-f80:128:128"
+target triple = "x86_64-undermydesk-freebsd8.0"
+	%struct.mbuf = type <{ %struct.mbuf*, i8*, i32, i8, i8, i8, i8 }>
+
+define i32 @crash(%struct.mbuf* %m) nounwind {
+entry:
+	br label %for.cond
+
+for.cond:		; preds = %if.end, %entry
+	%i.0 = phi i32 [ 0, %entry ], [ %inc, %if.end ]		; <i32> [#uses=3]
+	%chksum.0 = phi i8 [ 0, %entry ], [ %conv3, %if.end ]		; <i8> [#uses=3]
+	%cmp = icmp slt i32 %i.0, 1		; <i1> [#uses=1]
+	br i1 %cmp, label %for.body, label %do.body
+
+for.body:		; preds = %for.cond
+	br i1 undef, label %if.end, label %do.body
+
+if.end:		; preds = %for.body
+	%i.02 = trunc i32 %i.0 to i8		; <i8> [#uses=1]
+	%conv3 = add i8 %chksum.0, %i.02		; <i8> [#uses=1]
+	%inc = add i32 %i.0, 1		; <i32> [#uses=1]
+	br label %for.cond
+
+do.body:		; preds = %do.cond, %for.body, %for.cond
+	%chksum.2 = phi i8 [ undef, %do.cond ], [ %chksum.0, %for.body ], [ %chksum.0, %for.cond ]		; <i8> [#uses=1]
+	br i1 undef, label %do.cond, label %bb.nph
+
+bb.nph:		; preds = %do.body
+	br label %while.body
+
+while.body:		; preds = %while.body, %bb.nph
+	%chksum.13 = phi i8 [ undef, %while.body ], [ %chksum.2, %bb.nph ]		; <i8> [#uses=0]
+	br i1 undef, label %do.cond, label %while.body
+
+do.cond:		; preds = %while.body, %do.body
+	br i1 false, label %do.end, label %do.body
+
+do.end:		; preds = %do.cond
+	ret i32 0
+}