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comparison src/cpu/x86/vm/x86_32.ad @ 1575:3657cb01ffc5

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6954029: Improve implicit null check generation with compressed oops Summary: Hoist DecodeN instruction above null check Reviewed-by: never, twisti
author kvn
date Wed, 02 Jun 2010 09:49:32 -0700
parents 110501f54a99
children e9ff18c4ace7
comparison
equal deleted inserted replaced
1574:1eb493f33423 1575:3657cb01ffc5
1374 1374
1375 // Should the Matcher clone shifts on addressing modes, expecting them to 1375 // Should the Matcher clone shifts on addressing modes, expecting them to
1376 // be subsumed into complex addressing expressions or compute them into 1376 // be subsumed into complex addressing expressions or compute them into
1377 // registers? True for Intel but false for most RISCs 1377 // registers? True for Intel but false for most RISCs
1378 const bool Matcher::clone_shift_expressions = true; 1378 const bool Matcher::clone_shift_expressions = true;
1379
1380 bool Matcher::narrow_oop_use_complex_address() {
1381 ShouldNotCallThis();
1382 return true;
1383 }
1384
1379 1385
1380 // Is it better to copy float constants, or load them directly from memory? 1386 // Is it better to copy float constants, or load them directly from memory?
1381 // Intel can load a float constant from a direct address, requiring no 1387 // Intel can load a float constant from a direct address, requiring no
1382 // extra registers. Most RISCs will have to materialize an address into a 1388 // extra registers. Most RISCs will have to materialize an address into a
1383 // register first, so they would do better to copy the constant from stack. 1389 // register first, so they would do better to copy the constant from stack.