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| 1901 | serge | 1 | /* |
| 2 | * Copyright © 2010 Intel Corporation |
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| 3 | * |
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 5 | * copy of this software and associated documentation files (the "Software"), |
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| 6 | * to deal in the Software without restriction, including without limitation |
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 9 | * Software is furnished to do so, subject to the following conditions: |
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| 10 | * |
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| 11 | * The above copyright notice and this permission notice (including the next |
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| 12 | * paragraph) shall be included in all copies or substantial portions of the |
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| 13 | * Software. |
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| 14 | * |
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 21 | * DEALINGS IN THE SOFTWARE. |
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| 22 | */ |
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| 23 | |||
| 24 | /** |
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| 25 | * \file ir_function_can_inline.cpp |
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| 26 | * |
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| 27 | * Determines if we can inline a function call using ir_function_inlining.cpp. |
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| 28 | * |
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| 29 | * The primary restriction is that we can't return from the function |
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| 30 | * other than as the last instruction. We could potentially work |
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| 31 | * around this for some constructs by flattening control flow and |
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| 32 | * moving the return to the end, or by using breaks from a do {} while |
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| 33 | * (0) loop surrounding the function body. |
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| 34 | */ |
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| 35 | |||
| 36 | #include "ir.h" |
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| 37 | |||
| 38 | class ir_function_can_inline_visitor : public ir_hierarchical_visitor { |
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| 39 | public: |
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| 40 | ir_function_can_inline_visitor() |
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| 41 | { |
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| 42 | this->num_returns = 0; |
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| 43 | } |
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| 44 | |||
| 45 | virtual ir_visitor_status visit_enter(ir_return *); |
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| 46 | |||
| 47 | int num_returns; |
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| 48 | }; |
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| 49 | |||
| 50 | ir_visitor_status |
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| 51 | ir_function_can_inline_visitor::visit_enter(ir_return *ir) |
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| 52 | { |
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| 53 | (void) ir; |
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| 54 | this->num_returns++; |
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| 55 | return visit_continue; |
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| 56 | } |
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| 57 | |||
| 58 | bool |
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| 59 | can_inline(ir_call *call) |
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| 60 | { |
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| 61 | ir_function_can_inline_visitor v; |
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| 62 | const ir_function_signature *callee = call->get_callee(); |
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| 63 | if (!callee->is_defined) |
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| 64 | return false; |
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| 65 | |||
| 66 | v.run((exec_list *) &callee->body); |
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| 67 | |||
| 68 | /* If the function is empty (no last instruction) or does not end with a |
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| 69 | * return statement, we need to count the implicit return. |
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| 70 | */ |
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| 71 | ir_instruction *last = (ir_instruction *)callee->body.get_tail(); |
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| 72 | if (last == NULL || !last->as_return()) |
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| 73 | v.num_returns++; |
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| 74 | |||
| 75 | return v.num_returns == 1; |
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| 76 | } |