1 files changed, 40 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/fast-isel-trunc-kill-subreg.ll b/llvm/test/CodeGen/X86/fast-isel-trunc-kill-subreg.ll
new file mode 100644
index 00000000000..96a1a2dea17
--- /dev/null
+++ b/llvm/test/CodeGen/X86/fast-isel-trunc-kill-subreg.ll
@@ -0,0 +1,40 @@
+; RUN: llc %s -o - -fast-isel=true -O1 -verify-machineinstrs | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-unknown"
+
+; This test failed the machine verifier because the trunc at the start of the
+; method was extracing a subreg and killing the source register.  The kill flag was
+; invalid here as the source of the trunc could still be used elsewhere.
+
+; CHECK-LABEL: @test
+
+define i32 @test(i32 %block8x8) {
+bb:
+  %tmp9 = trunc i32 %block8x8 to i1
+  %tmp10 = zext i1 %tmp9 to i32
+  %tmp11 = mul i32 %tmp10, 8
+  %tmp12 = zext i32 %tmp11 to i64
+  br label %bb241
+
+bb241:                                            ; preds = %bb241, %bb
+  %lsr.iv3 = phi i64 [ %lsr.iv.next4, %bb241 ], [ %tmp12, %bb ]
+  %lsr.iv1 = phi i32 [ %lsr.iv.next2, %bb241 ], [ 0, %bb ]
+  %lsr.iv.next2 = add nuw nsw i32 %lsr.iv1, 1
+  %lsr.iv.next4 = add i64 %lsr.iv3, 32
+  %exitcond = icmp eq i32 %lsr.iv.next2, 8
+  br i1 %exitcond, label %.preheader.preheader, label %bb241
+
+.preheader.preheader:                             ; preds = %bb241
+  %tmp18 = lshr i32 %block8x8, 1
+  br label %bb270
+
+bb270:                                            ; preds = %bb270, %.preheader.preheader
+  %lsr.iv = phi i32 [ %lsr.iv.next, %bb270 ], [ %tmp18, %.preheader.preheader ]
+  %lsr.iv.next = add i32 %lsr.iv, 4
+  %tmp272 = icmp slt i32 %lsr.iv.next, 100
+  br i1 %tmp272, label %bb270, label %.loopexit
+
+.loopexit:                                        ; preds = %bb270
+  ret i32 0
+}