1 files changed, 83 insertions, 0 deletions
diff --git a/test/CodeGen/PowerPC/negctr.ll b/test/CodeGen/PowerPC/negctr.ll
new file mode 100644
index 0000000000..2f6995c65d
--- /dev/null
+++ b/test/CodeGen/PowerPC/negctr.ll
@@ -0,0 +1,83 @@
+; RUN: llc < %s -mcpu=a2 | FileCheck %s
+; RUN: llc < %s -mcpu=a2 -disable-lsr | FileCheck -check-prefix=NOLSR %s
+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-f128:128:128-v128:128:128-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+define void @main() #0 {
+entry:
+  br i1 undef, label %for.end, label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 1, %entry ]
+  %indvars.iv.next = add i64 %indvars.iv, 1
+  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+  %exitcond = icmp eq i32 %lftr.wideiv, 0
+  br i1 %exitcond, label %for.end, label %for.body
+
+; FIXME: We currently can't form the 32-bit unsigned trip count necessary here!
+; CHECK: @main
+; CHECK-NOT: bdnz
+
+for.end:                                          ; preds = %for.body, %entry
+  ret void
+}
+
+define void @main1() #0 {
+entry:
+  br i1 undef, label %for.end, label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 1, %entry ]
+  %indvars.iv.next = add i64 %indvars.iv, 1
+  %exitcond = icmp eq i64 %indvars.iv.next, 0
+  br i1 %exitcond, label %for.end, label %for.body
+
+; CHECK: @main1
+; CHECK: li [[REG:[0-9]+]], -1
+; CHECK: mtctr [[REG]]
+; CHECK: bdnz
+
+for.end:                                          ; preds = %for.body, %entry
+  ret void
+}
+
+define void @main2() #0 {
+entry:
+  br i1 undef, label %for.end, label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 1, %entry ]
+  %indvars.iv.next = add i64 %indvars.iv, 1
+  %exitcond = icmp eq i64 %indvars.iv.next, -100000
+  br i1 %exitcond, label %for.end, label %for.body
+
+; CHECK: @main2
+; CHECK: lis [[REG:[0-9]+]], -2
+; CHECK: ori [[REG2:[0-9]+]], [[REG]], 31071
+; CHECK: mtctr [[REG2]]
+; CHECK: bdnz
+
+for.end:                                          ; preds = %for.body, %entry
+  ret void
+}
+
+define void @main3() #0 {
+entry:
+  br i1 undef, label %for.end, label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 127984, %entry ]
+  %indvars.iv.next = add i64 %indvars.iv, -16
+  %exitcond = icmp eq i64 %indvars.iv.next, -16
+  br i1 %exitcond, label %for.end, label %for.body
+
+; NOLSR: @main3
+; NOLSR: li [[REG:[0-9]+]], 8000
+; NOLSR: mtctr [[REG]]
+; NOLSR: bdnz
+
+for.end:                                          ; preds = %for.body, %entry
+  ret void
+}
+
+attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }