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Diffstat (limited to 'llvm/test/Transforms/InstCombine/ARM/tbl1.ll')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/ARM/tbl1.ll | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/ARM/tbl1.ll b/llvm/test/Transforms/InstCombine/ARM/tbl1.ll new file mode 100644 index 00000000000..f3cd9102cdf --- /dev/null +++ b/llvm/test/Transforms/InstCombine/ARM/tbl1.ll @@ -0,0 +1,35 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py +; RUN: opt < %s -instcombine -S | FileCheck %s + +target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" +target triple = "armv8-arm-none-eabi" + +; Turning a table lookup intrinsic into a shuffle vector instruction +; can be beneficial. If the mask used for the lookup is the constant +; vector {7,6,5,4,3,2,1,0}, then the back-end generates rev64 +; instructions instead. + +define <8 x i8> @tbl1_8x8(<8 x i8> %vec) { +; CHECK-LABEL: @tbl1_8x8( +; CHECK-NEXT: entry: +; CHECK-NEXT: [[TMP0:%.*]] = shufflevector <8 x i8> [[VEC:%.*]], <8 x i8> undef, <8 x i32> <i32 7, i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0> +; CHECK-NEXT: ret <8 x i8> [[TMP0]] +; +entry: + %vtbl1 = call <8 x i8> @llvm.arm.neon.vtbl1(<8 x i8> %vec, <8 x i8> <i8 7, i8 6, i8 5, i8 4, i8 3, i8 2, i8 1, i8 0>) + ret <8 x i8> %vtbl1 +} + +; Bail the optimization if a mask index is out of range. +define <8 x i8> @tbl1_8x8_out_of_range(<8 x i8> %vec) { +; CHECK-LABEL: @tbl1_8x8_out_of_range( +; CHECK-NEXT: entry: +; CHECK-NEXT: [[VTBL1:%.*]] = call <8 x i8> @llvm.arm.neon.vtbl1(<8 x i8> [[VEC:%.*]], <8 x i8> <i8 8, i8 6, i8 5, i8 4, i8 3, i8 2, i8 1, i8 0>) +; CHECK-NEXT: ret <8 x i8> [[VTBL1]] +; +entry: + %vtbl1 = call <8 x i8> @llvm.arm.neon.vtbl1(<8 x i8> %vec, <8 x i8> <i8 8, i8 6, i8 5, i8 4, i8 3, i8 2, i8 1, i8 0>) + ret <8 x i8> %vtbl1 +} + +declare <8 x i8> @llvm.arm.neon.vtbl1(<8 x i8>, <8 x i8>) |
