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-rw-r--r--test/CodeGen/X86/coalescer-subreg.ll29
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diff --git a/test/CodeGen/X86/coalescer-subreg.ll b/test/CodeGen/X86/coalescer-subreg.ll
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+++ b/test/CodeGen/X86/coalescer-subreg.ll
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+; RUN: llc -o - %s -verify-machineinstrs
+; This used to crash when coalescing a regclass like GR16 which did not support
+; the sub_8bit_hi subregister with a class like GR16_ABCD that did.
+target triple = "x86_64-apple-macosx10.10.0"
+
+define void @test() #0 {
+entry:
+ br i1 undef, label %loop, label %for.end597
+
+loop:
+ %0 = load i16, i16* null, align 4
+ %1 = load i16, i16* undef, align 4
+ %or1 = or i16 %1, %0
+ %or2 = trunc i16 %or1 to i8
+ store i8 %or2, i8* undef, align 4
+ %2 = or i16 %1, %0
+ %or3 = lshr i16 %2, 8
+ %or4 = trunc i16 %or3 to i8
+ store i8 %or4, i8* undef, align 1
+ %3 = load i32, i32* undef, align 4
+ %4 = load i32, i32* undef, align 4
+ %or5 = or i32 %4, %3
+ store i32 %or5, i32* undef, align 4
+ store i32 0, i32* undef, align 4
+ br label %loop
+
+for.end597:
+ ret void
+}