1fa1251116
This adds a variable op, emitted as C/C++ locale variable, which can be
used if the `emitc.constant` op is not sufficient.
As an example, the canonicalization pass would transform
```mlir
%0 = "emitc.constant"() {value = 0 : i32} : () -> i32
%1 = "emitc.constant"() {value = 0 : i32} : () -> i32
%2 = emitc.apply "&"(%0) : (i32) -> !emitc.ptr<i32>
%3 = emitc.apply "&"(%1) : (i32) -> !emitc.ptr<i32>
emitc.call "write"(%2, %3) : (!emitc.ptr<i32>, !emitc.ptr<i32>) -> ()
```
into
```mlir
%0 = "emitc.constant"() {value = 0 : i32} : () -> i32
%1 = emitc.apply "&"(%0) : (i32) -> !emitc.ptr<i32>
%2 = emitc.apply "&"(%0) : (i32) -> !emitc.ptr<i32>
emitc.call "write"(%1, %2) : (!emitc.ptr<i32>, !emitc.ptr<i32>) -> ()
```
resulting in pointer aliasing, as %1 and %2 point to the same address.
In such a case, the `emitc.variable` operation can be used instead.
Reviewed By: jpienaar
Differential Revision: https://reviews.llvm.org/D120098
38 lines
1.6 KiB
MLIR
38 lines
1.6 KiB
MLIR
// RUN: mlir-translate -mlir-to-cpp %s | FileCheck %s -check-prefix=CPP-DEFAULT
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// RUN: mlir-translate -mlir-to-cpp -declare-variables-at-top %s | FileCheck %s -check-prefix=CPP-DECLTOP
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func @emitc_variable() {
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%c0 = "emitc.variable"(){value = #emitc.opaque<""> : i32} : () -> i32
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%c1 = "emitc.variable"(){value = 42 : i32} : () -> i32
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%c2 = "emitc.variable"(){value = -1 : i32} : () -> i32
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%c3 = "emitc.variable"(){value = -1 : si8} : () -> si8
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%c4 = "emitc.variable"(){value = 255 : ui8} : () -> ui8
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%c5 = "emitc.variable"(){value = #emitc.opaque<""> : !emitc.ptr<i32>} : () -> !emitc.ptr<i32>
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%c6 = "emitc.variable"(){value = #emitc.opaque<"NULL"> : !emitc.ptr<i32>} : () -> !emitc.ptr<i32>
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return
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}
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// CPP-DEFAULT: void emitc_variable() {
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// CPP-DEFAULT-NEXT: int32_t [[V0:[^ ]*]];
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// CPP-DEFAULT-NEXT: int32_t [[V1:[^ ]*]] = 42;
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// CPP-DEFAULT-NEXT: int32_t [[V2:[^ ]*]] = -1;
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// CPP-DEFAULT-NEXT: int8_t [[V3:[^ ]*]] = -1;
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// CPP-DEFAULT-NEXT: uint8_t [[V4:[^ ]*]] = 255;
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// CPP-DEFAULT-NEXT: int32_t* [[V5:[^ ]*]];
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// CPP-DEFAULT-NEXT: int32_t* [[V6:[^ ]*]] = NULL;
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// CPP-DECLTOP: void emitc_variable() {
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// CPP-DECLTOP-NEXT: int32_t [[V0:[^ ]*]];
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// CPP-DECLTOP-NEXT: int32_t [[V1:[^ ]*]];
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// CPP-DECLTOP-NEXT: int32_t [[V2:[^ ]*]];
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// CPP-DECLTOP-NEXT: int8_t [[V3:[^ ]*]];
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// CPP-DECLTOP-NEXT: uint8_t [[V4:[^ ]*]];
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// CPP-DECLTOP-NEXT: int32_t* [[V5:[^ ]*]];
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// CPP-DECLTOP-NEXT: int32_t* [[V6:[^ ]*]];
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// CPP-DECLTOP-NEXT: ;
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// CPP-DECLTOP-NEXT: [[V1]] = 42;
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// CPP-DECLTOP-NEXT: [[V2]] = -1;
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// CPP-DECLTOP-NEXT: [[V3]] = -1;
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// CPP-DECLTOP-NEXT: [[V4]] = 255;
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// CPP-DECLTOP-NEXT: ;
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// CPP-DECLTOP-NEXT: [[V6]] = NULL;
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