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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5563 | 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 lower_noise.cpp |
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| 26 | * IR lower pass to remove noise opcodes. |
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| 27 | * |
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| 28 | * \author Ian Romanick |
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| 29 | */ |
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| 30 | |||
| 31 | #include "ir.h" |
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| 32 | #include "ir_rvalue_visitor.h" |
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| 33 | |||
| 34 | class lower_noise_visitor : public ir_rvalue_visitor { |
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| 35 | public: |
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| 36 | lower_noise_visitor() : progress(false) |
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| 37 | { |
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| 38 | /* empty */ |
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| 39 | } |
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| 40 | |||
| 41 | void handle_rvalue(ir_rvalue **rvalue) |
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| 42 | { |
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| 43 | if (!*rvalue) |
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| 44 | return; |
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| 45 | |||
| 46 | ir_expression *expr = (*rvalue)->as_expression(); |
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| 47 | if (!expr) |
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| 48 | return; |
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| 49 | |||
| 50 | /* In the future, ir_unop_noise may be replaced by a call to a function |
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| 51 | * that implements noise. No hardware has a noise instruction. |
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| 52 | */ |
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| 53 | if (expr->operation == ir_unop_noise) { |
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| 54 | *rvalue = ir_constant::zero(ralloc_parent(expr), expr->type); |
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| 55 | this->progress = true; |
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| 56 | } |
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| 57 | } |
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| 58 | |||
| 59 | bool progress; |
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| 60 | }; |
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| 61 | |||
| 62 | |||
| 63 | bool |
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| 64 | lower_noise(exec_list *instructions) |
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| 65 | { |
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| 66 | lower_noise_visitor v; |
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| 67 | |||
| 68 | visit_list_elements(&v, instructions); |
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| 69 | |||
| 70 | return v.progress; |
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| 71 | } |