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Vectorize Ramp in OpenGLCompute backend #6372

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Nov 3, 2021
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Vectorize Ramp in OpenGLCompute backend #6372

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20 changes: 12 additions & 8 deletions src/CodeGen_OpenGLCompute_Dev.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -550,20 +550,24 @@ void CodeGen_OpenGLCompute_C::visit(const For *loop) {
}

void CodeGen_OpenGLCompute_C::visit(const Ramp *op) {
ostringstream rhs;
rhs << print_type(op->type) << "(";

if (op->lanes > 4) {
internal_error << "GLSL: ramp lanes " << op->lanes << " is not supported\n";
}

rhs << print_expr(op->base);

for (int i = 1; i < op->lanes; ++i) {
rhs << ", " << print_expr(Add::make(op->base, Mul::make(i, op->stride)));
ostringstream rhs;
// Print the sequence vec(0, 1, 2, ...).
rhs << print_type(op->type) << "(";
for (int i = 0; i < op->type.lanes(); i++) {
rhs << i;
if (i != op->type.lanes() - 1) {
rhs << ", ";
}
}

rhs << ")";

// Multiply by the stride and add the base.
rhs << " * " << print_expr(op->stride) << " + " << print_expr(op->base);

print_assignment(op->type, rhs.str());
}

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