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comparison gen/asmstmt.cpp @ 971:985104c0f1db

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Fix the problems exposed by the callingconv1.d test case. The first was that unless otherwise specified, inputs are assumed to be in registers even if they specify a "matching output" that's in memory. While testing that fix, I also ran into a bug causing the generated "matching output" for any input was always the first one instead of the correct one.
author Frits van Bommel <fvbommel wxs.nl>
date Tue, 17 Feb 2009 00:08:20 +0100
parents fe2d9bb7078d
children 6a32d2e18175
comparison
equal deleted inserted replaced
970:fb31a4afa2df 971:985104c0f1db
383 int n = 0; 383 int n = 0;
384 typedef std::deque<std::string>::iterator it; 384 typedef std::deque<std::string>::iterator it;
385 for(it i = output_constraints.begin(), e = output_constraints.end(); i != e; ++i, ++n) { 385 for(it i = output_constraints.begin(), e = output_constraints.end(); i != e; ++i, ++n) {
386 // rewrite update constraint to in and out constraints 386 // rewrite update constraint to in and out constraints
387 if((*i)[0] == '+') { 387 if((*i)[0] == '+') {
388 (*i)[0] = '='; 388 assert(*i == mrw_cns && "What else are we updating except memory?");
389 std::string input_constraint; 389 /* LLVM doesn't support updating operands, so split into an input
390 std::stringstream ss; 390 * and an output operand.
391 ss << n; 391 */
392 ss >> input_constraint; 392
393 //FIXME: I think multiple inout constraints will mess up the order! 393 // Change update operand to pure output operand.
394 input_constraints.push_front(input_constraint); 394 *i = mw_cns;
395
396 // Add input operand with same value, with original as "matching output".
397 std::ostringstream ss;
398 ss << m_cns << (n + asmblock->outputcount);
399 input_constraints.push_front(ss.str());
395 input_values.push_front(output_values[n]); 400 input_values.push_front(output_values[n]);
396 } 401 }
397 llvmOutConstraints += *i; 402 llvmOutConstraints += *i;
398 llvmOutConstraints += ","; 403 llvmOutConstraints += ",";
399 } 404 }
405 asmblock->outputcount += n;
406
400 for(it i = input_constraints.begin(), e = input_constraints.end(); i != e; ++i) { 407 for(it i = input_constraints.begin(), e = input_constraints.end(); i != e; ++i) {
401 llvmInConstraints += *i; 408 llvmInConstraints += *i;
402 llvmInConstraints += ","; 409 llvmInConstraints += ",";
403 } 410 }
404 411