Remember to handle sub-registers when moving imp-defs to a rematted instruction.
llvm-svn: 96995
diff --git a/llvm/test/CodeGen/X86/2010-02-23-RematImplicitSubreg.ll b/llvm/test/CodeGen/X86/2010-02-23-RematImplicitSubreg.ll
new file mode 100644
index 0000000..4a26ba0
--- /dev/null
+++ b/llvm/test/CodeGen/X86/2010-02-23-RematImplicitSubreg.ll
@@ -0,0 +1,49 @@
+; RUN: llc < %s
+; PR6372
+;
+; This test produces a move instruction with an implicitly defined super-register:
+;
+; %DL<def> = MOV8rr %reg1038<kill>, %RDX<imp-def>
+;
+; When %DL is rematerialized, we must remember to update live intervals for
+; sub-registers %DX and %EDX.
+
+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-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-apple-darwin10.0.0"
+
+define noalias i8* @foo() nounwind ssp {
+entry:
+ br i1 undef, label %for.end, label %for.body
+
+for.body: ; preds = %if.end40, %entry
+ %tmp6 = load i8* undef, align 2 ; <i8> [#uses=3]
+ %conv11 = sext i8 %tmp6 to i64 ; <i64> [#uses=1]
+ %cmp15 = icmp slt i64 %conv11, undef ; <i1> [#uses=1]
+ br i1 %cmp15, label %if.end, label %if.then
+
+if.then: ; preds = %for.body
+ %conv18 = sext i8 %tmp6 to i32 ; <i32> [#uses=1]
+ %call = tail call i32 (...)* @invalid(i32 0, i32 0, i32 %conv18) nounwind ; <i32> [#uses=0]
+ br label %if.end
+
+if.end: ; preds = %if.then, %for.body
+ %index.0 = phi i8 [ 0, %if.then ], [ %tmp6, %for.body ] ; <i8> [#uses=1]
+ store i8 %index.0, i8* undef
+ %tmp24 = load i8* undef ; <i8> [#uses=2]
+ br i1 undef, label %if.end40, label %if.then36
+
+if.then36: ; preds = %if.end
+ %conv38 = sext i8 %tmp24 to i32 ; <i32> [#uses=1]
+ %call39 = tail call i32 (...)* @invalid(i32 0, i32 0, i32 %conv38) nounwind ; <i32> [#uses=0]
+ br label %if.end40
+
+if.end40: ; preds = %if.then36, %if.end
+ %index.1 = phi i8 [ 0, %if.then36 ], [ %tmp24, %if.end ] ; <i8> [#uses=1]
+ store i8 %index.1, i8* undef
+ br i1 false, label %for.body, label %for.end
+
+for.end: ; preds = %if.end40, %entry
+ ret i8* undef
+}
+
+declare i32 @invalid(...)