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https://github.com/c64scene-ar/llvm-6502.git
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f5f8a3e6a6
It can help with argument juggling on some targets, and is generally a good idea. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226740 91177308-0d34-0410-b5e6-96231b3b80d8
45 lines
1.1 KiB
LLVM
45 lines
1.1 KiB
LLVM
; RUN: llc -mtriple=aarch64-linux-gnu -o - %s | FileCheck %s
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define i32 @test_consts(i32 %in) {
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; CHECK-LABEL: test_consts:
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; CHECK-NOT: bfxil
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; CHECK-NOT: and
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; CHECK-NOT: orr
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; CHECK: ret
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%lo = and i32 %in, 65535
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%hi = and i32 %in, -65536
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%res = or i32 %lo, %hi
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ret i32 %res
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}
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define i32 @test_generic(i32 %in, i32 %mask1, i32 %mask2) {
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; CHECK-LABEL: test_generic:
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; CHECK: orr [[FULL_MASK:w[0-9]+]], w1, w2
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; CHECK: and w0, w0, [[FULL_MASK]]
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%lo = and i32 %in, %mask1
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%hi = and i32 %in, %mask2
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%res = or i32 %lo, %hi
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ret i32 %res
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}
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; In this case the transformation isn't profitable, since %lo and %hi
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; are used more than once.
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define [3 x i32] @test_reuse(i32 %in, i32 %mask1, i32 %mask2) {
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; CHECK-LABEL: test_reuse:
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; CHECK-DAG: and w1, w0, w1
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; CHECK-DAG: and w2, w0, w2
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; CHECK-DAG: orr w0, w1, w2
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%lo = and i32 %in, %mask1
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%hi = and i32 %in, %mask2
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%recombine = or i32 %lo, %hi
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%res.tmp0 = insertvalue [3 x i32] undef, i32 %recombine, 0
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%res.tmp1 = insertvalue [3 x i32] %res.tmp0, i32 %lo, 1
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%res = insertvalue [3 x i32] %res.tmp1, i32 %hi, 2
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ret [3 x i32] %res
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}
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