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llvm-mirror/test/CodeGen/ARM/2009-12-02-vtrn-undef.ll
Bob Wilson b53c801366 Recognize canonical forms of vector shuffles where the same vector is used for
both source operands.  In the canonical form, the 2nd operand is changed to an
undef and the shuffle mask is adjusted to only reference elements from the 1st
operand.  Radar 7434842.

llvm-svn: 90417
2009-12-03 06:40:55 +00:00

20 lines
1.1 KiB
LLVM

; RUN: llc -mcpu=cortex-a8 < %s | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:32-n32"
target triple = "armv7-apple-darwin10"
%struct.int16x8_t = type { <8 x i16> }
%struct.int16x8x2_t = type { [2 x %struct.int16x8_t] }
define arm_apcscc void @t(%struct.int16x8x2_t* noalias nocapture sret %agg.result, <8 x i16> %tmp.0, %struct.int16x8x2_t* nocapture %dst) nounwind {
entry:
;CHECK: vtrn.16
%0 = shufflevector <8 x i16> %tmp.0, <8 x i16> undef, <8 x i32> <i32 0, i32 0, i32 2, i32 2, i32 4, i32 4, i32 6, i32 6>
%1 = shufflevector <8 x i16> %tmp.0, <8 x i16> undef, <8 x i32> <i32 1, i32 1, i32 3, i32 3, i32 5, i32 5, i32 7, i32 7>
%agg.result1218.0 = getelementptr %struct.int16x8x2_t* %agg.result, i32 0, i32 0, i32 0, i32 0 ; <<8 x i16>*>
store <8 x i16> %0, <8 x i16>* %agg.result1218.0, align 16
%agg.result12.1.0 = getelementptr %struct.int16x8x2_t* %agg.result, i32 0, i32 0, i32 1, i32 0 ; <<8 x i16>*>
store <8 x i16> %1, <8 x i16>* %agg.result12.1.0, align 16
ret void
}