llvm-6502/test/CodeGen/ARM/2009-08-31-TwoRegShuffle.ll

; RUN: llvm-as < %s | llc -march=arm -mattr=+neon | FileCheck %s
; pr4843
define <4 x i16> @v2regbug(<4 x i16>* %B) nounwind {
;CHECK: v2regbug:
;CHECK: vzip.16
	%tmp1 = load <4 x i16>* %B
	%tmp2 = shufflevector <4 x i16> %tmp1, <4 x i16> undef, <4 x i32><i32 0, i32 0, i32 1, i32 1>
	ret <4 x i16> %tmp2
}
Fix pr4843: When an instruction has multiple destination registers that are tied to different source registers, the TwoAddressInstructionPass needs to be smarter. Change it to check before replacing a source register whether that source register is tied to a different destination register, and if so, defer handling it until a subsequent iteration. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80654 91177308-0d34-0410-b5e6-96231b3b80d8 2009-09-01 04:18:40 +00:00			`; RUN: llvm-as < %s \| llc -march=arm -mattr=+neon \| FileCheck %s`
			`; pr4843`
			`define <4 x i16> @v2regbug(<4 x i16>* %B) nounwind {`
			`;CHECK: v2regbug:`
			`;CHECK: vzip.16`
			`%tmp1 = load <4 x i16>* %B`
			`%tmp2 = shufflevector <4 x i16> %tmp1, <4 x i16> undef, <4 x i32><i32 0, i32 0, i32 1, i32 1>`
			`ret <4 x i16> %tmp2`
			`}`