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Wasm backend: support reinterpret conversion in C wasm emulator

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This commit is contained in:
Alexey Andreev 2018-05-17 23:58:01 +03:00
parent dbe31c43bf
commit 9b2e00cb9f
2 changed files with 35 additions and 4 deletions
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16
core/src/main/java/org/teavm/backend/wasm/render/WasmCRenderingVisitor.java
View File

@ -642,21 +642,27 @@ class WasmCRenderingVisitor implements WasmExpressionVisitor {
if (type != null && expression.getSourceType() != expression.getTargetType()) {
switch (expression.getTargetType()) {
case INT32:
if (expression.isSigned()) {
if (expression.getSourceType() == WasmType.FLOAT32 && expression.isReinterpret()) {
result.setText("reinterpret_float32(" + operand.getText() + ")");
} else if (expression.isSigned()) {
result.setText("(int32_t) " + operand.getText());
} else {
result.setText("(uint32_t) " + operand.getText());
}
break;
case INT64:
if (expression.isSigned()) {
if (expression.getSourceType() == WasmType.FLOAT64 && expression.isReinterpret()) {
result.setText("reinterpret_float64(" + operand.getText() + ")");
} else if (expression.isSigned()) {
result.setText("(int64_t) " + operand.getText());
} else {
result.setText("(uint64_t) " + operand.getText());
}
break;
case FLOAT32:
if (expression.getSourceType() == WasmType.FLOAT64) {
if (expression.getSourceType() == WasmType.INT32 && expression.isReinterpret()) {
result.setText("reinterpret_int32(" + operand.getText() + ")");
} else if (expression.getSourceType() == WasmType.FLOAT64) {
result.setText("(float) " + operand.getText());
} else if (expression.isSigned()) {
result.setText("(float) (int64_t) " + operand.getText());
@ -665,7 +671,9 @@ class WasmCRenderingVisitor implements WasmExpressionVisitor {
}
break;
case FLOAT64:
if (expression.getSourceType() == WasmType.FLOAT32) {
if (expression.getSourceType() == WasmType.INT64 && expression.isReinterpret()) {
result.setText("reinterpret_int64(" + operand.getText() + ")");
} else if (expression.getSourceType() == WasmType.FLOAT32) {
result.setText("(double) " + operand.getText());
} else if (expression.isSigned()) {
result.setText("(double) (int64_t) " + operand.getText());

23
core/src/main/resources/org/teavm/backend/wasm/wasm-runtime.c
View File

@ -17,4 +17,27 @@ static int64_t currentTimeMillis() {
clock_gettime(CLOCK_REALTIME, &time);
return time.tv_sec * 1000 + (int64_t) round(time.tv_nsec / 1000000);
}
static union { float f; int32_t i; } reinterpret_union_32;
static union { double f; int64_t i; } reinterpret_union_64;
inline static int64_t reinterpret_float64(double v) {
reinterpret_union_64.f = v;
return reinterpret_union_64.i;
}
inline static double reinterpret_int64(int64_t v) {
reinterpret_union_64.i = v;
return reinterpret_union_64.f;
}
inline static int32_t reinterpret_float32(double v) {
reinterpret_union_32.f = v;
return reinterpret_union_32.i;
}
inline static float reinterpret_int32(int32_t v) {
reinterpret_union_32.i = v;
return reinterpret_union_32.f;
}