Add test case from PR2659.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62006 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/phys_subreg_coalesce-2.ll b/test/CodeGen/X86/phys_subreg_coalesce-2.ll
new file mode 100644 (file)
index 0000000..7ca3ea8
--- /dev/null
+++ b/test/CodeGen/X86/phys_subreg_coalesce-2.ll
@@ -0,0 +1,30 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep mov | count 5
+; PR2659
+
+define i32 @binomial(i32 %n, i32 %k) nounwind {
+entry:
+       %cmp = icmp ugt i32 %k, %n              ; <i1> [#uses=1]
+       br i1 %cmp, label %ifthen, label %forcond.preheader
+
+forcond.preheader:             ; preds = %entry
+       %cmp44 = icmp eq i32 %k, 0              ; <i1> [#uses=1]
+       br i1 %cmp44, label %afterfor, label %forbody
+
+ifthen:                ; preds = %entry
+       ret i32 0
+
+forbody:               ; preds = %forbody, %forcond.preheader
+       %indvar = phi i32 [ 0, %forcond.preheader ], [ %divisor.02, %forbody ]          ; <i32> [#uses=3]
+       %accumulator.01 = phi i32 [ 1, %forcond.preheader ], [ %div, %forbody ]         ; <i32> [#uses=1]
+       %divisor.02 = add i32 %indvar, 1                ; <i32> [#uses=2]
+       %n.addr.03 = sub i32 %n, %indvar                ; <i32> [#uses=1]
+       %mul = mul i32 %n.addr.03, %accumulator.01              ; <i32> [#uses=1]
+       %div = udiv i32 %mul, %divisor.02               ; <i32> [#uses=2]
+       %inc = add i32 %indvar, 2               ; <i32> [#uses=1]
+       %cmp4 = icmp ugt i32 %inc, %k           ; <i1> [#uses=1]
+       br i1 %cmp4, label %afterfor, label %forbody
+
+afterfor:              ; preds = %forbody, %forcond.preheader
+       %accumulator.0.lcssa = phi i32 [ 1, %forcond.preheader ], [ %div, %forbody ]            ; <i32> [#uses=1]
+       ret i32 %accumulator.0.lcssa
+}