1 files changed, 123 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/narrow-switch.ll b/test/Transforms/InstCombine/narrow-switch.ll
new file mode 100644
index 000000000000..f3f19bae03dd
--- /dev/null
+++ b/test/Transforms/InstCombine/narrow-switch.ll
@@ -0,0 +1,123 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
+
+; CHECK-LABEL: define i32 @positive1
+; CHECK: switch i32
+; CHECK: i32 10, label
+; CHECK: i32 100, label
+; CHECK: i32 1001, label
+
+define i32 @positive1(i64 %a) {
+entry:
+  %and = and i64 %a, 4294967295
+  switch i64 %and, label %sw.default [
+    i64 10, label %return
+    i64 100, label %sw.bb1
+    i64 1001, label %sw.bb2
+  ]
+
+sw.bb1:
+  br label %return
+
+sw.bb2:
+  br label %return
+
+sw.default:
+  br label %return
+
+return:
+  %retval.0 = phi i32 [ 24, %sw.default ], [ 123, %sw.bb2 ], [ 213, %sw.bb1 ], [ 231, %entry ]
+  ret i32 %retval.0
+}
+
+; CHECK-LABEL: define i32 @negative1
+; CHECK: switch i32
+; CHECK: i32 -10, label
+; CHECK: i32 -100, label
+; CHECK: i32 -1001, label
+
+define i32 @negative1(i64 %a) {
+entry:
+  %or = or i64 %a, -4294967296
+  switch i64 %or, label %sw.default [
+    i64 -10, label %return
+    i64 -100, label %sw.bb1
+    i64 -1001, label %sw.bb2
+  ]
+
+sw.bb1:
+  br label %return
+
+sw.bb2:
+  br label %return
+
+sw.default:
+  br label %return
+
+return:
+  %retval.0 = phi i32 [ 24, %sw.default ], [ 123, %sw.bb2 ], [ 213, %sw.bb1 ], [ 231, %entry ]
+  ret i32 %retval.0
+}
+
+; Make sure truncating a constant int larger than 64-bit doesn't trigger an
+; assertion.
+
+; CHECK-LABEL: define i32 @trunc72to68
+; CHECK: switch i68
+; CHECK: i68 10, label
+; CHECK: i68 100, label
+; CHECK: i68 1001, label
+
+define i32 @trunc72to68(i72 %a) {
+entry:
+  %and = and i72 %a, 295147905179352825855
+  switch i72 %and, label %sw.default [
+    i72 10, label %return
+    i72 100, label %sw.bb1
+    i72 1001, label %sw.bb2
+  ]
+
+sw.bb1:
+  br label %return
+
+sw.bb2:
+  br label %return
+
+sw.default:
+  br label %return
+
+return:
+  %retval.0 = phi i32 [ 24, %sw.default ], [ 123, %sw.bb2 ], [ 213, %sw.bb1 ], [ 231, %entry ]
+  ret i32 %retval.0
+}
+
+; Make sure to avoid assertion crashes and use the type before
+; truncation to generate the sub constant expressions that leads
+; to the recomputed condition.
+;
+; CHECK-LABEL: @trunc64to59
+; CHECK: switch i59
+; CHECK: i59 0, label
+; CHECK: i59 18717182647723699, label
+
+define void @trunc64to59(i64 %a) {
+entry:
+  %tmp0 = and i64 %a, 15
+  %tmp1 = mul i64 %tmp0, -6425668444178048401
+  %tmp2 = add i64 %tmp1, 5170979678563097242
+  %tmp3 = mul i64 %tmp2, 1627972535142754813
+  switch i64 %tmp3, label %sw.default [
+    i64 847514119312061490, label %sw.bb1
+    i64 866231301959785189, label %sw.bb2
+  ]
+
+sw.bb1:
+  br label %sw.default
+
+sw.bb2:
+  br label %sw.default
+
+sw.default:
+  ret void
+}