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author | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2015-04-09 20:04:47 +0000 |
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committer | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2015-04-09 20:04:47 +0000 |
commit | 66649e00c91e30fdfc8dd64b43cde2632a831138 (patch) | |
tree | d7433ee60fe2bcf357018aab98192a359502aaec /test/CodeGen/AArch64/concat_vector-truncated-scalar-combine.ll | |
parent | 117bf240ef0fdb7646f4c3ccc88e8ff504bbac26 (diff) |
[CodeGen] Combine concat_vector of trunc'd scalar to scalar_to_vector.
We already do:
concat_vectors(scalar, undef) -> scalar_to_vector(scalar)
When the scalar is legal.
When it's not, but is a truncated legal scalar, we can also do:
concat_vectors(trunc(scalar), undef) -> scalar_to_vector(scalar)
Which is equivalent, since the upper lanes are undef anyway.
While there, teach the combine to look at more than 2 operands.
Differential Revision: http://reviews.llvm.org/D8883
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234530 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/AArch64/concat_vector-truncated-scalar-combine.ll')
-rw-r--r-- | test/CodeGen/AArch64/concat_vector-truncated-scalar-combine.ll | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/test/CodeGen/AArch64/concat_vector-truncated-scalar-combine.ll b/test/CodeGen/AArch64/concat_vector-truncated-scalar-combine.ll new file mode 100644 index 00000000000..eb6c80df855 --- /dev/null +++ b/test/CodeGen/AArch64/concat_vector-truncated-scalar-combine.ll @@ -0,0 +1,18 @@ +; RUN: llc < %s -mtriple aarch64-unknown-unknown -asm-verbose=false | FileCheck %s + +target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128" + +; Test the (concat_vectors (bitcast (trunc (scalar))), undef..) pattern. + +define <8 x i8> @test_concat_from_truncated_scalar(i32 %x) #0 { +entry: +; CHECK-LABEL: test_concat_from_truncated_scalar: +; CHECK-NEXT: fmov s0, w0 +; CHECK-NEXT: ret + %t = trunc i32 %x to i16 + %0 = bitcast i16 %t to <2 x i8> + %1 = shufflevector <2 x i8> %0, <2 x i8> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 2, i32 2, i32 2, i32 2, i32 2> + ret <8 x i8> %1 +} + +attributes #0 = { nounwind } |