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comparison src/cpu/x86/vm/vm_version_x86.cpp @ 775:93c14e5562c4

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6823354: Add intrinsics for {Integer,Long}.{numberOfLeadingZeros,numberOfTrailingZeros}() Summary: These methods can be instrinsified by using bit scan, bit test, and population count instructions. Reviewed-by: kvn, never
author twisti
date Wed, 06 May 2009 00:27:52 -0700
parents fbde8ec322d0
children 323bd24c6520
comparison
equal deleted inserted replaced
755:36ee9b69616e 775:93c14e5562c4
282 // HT processor could be installed on a system which doesn't support HT. 282 // HT processor could be installed on a system which doesn't support HT.
283 _cpuFeatures &= ~CPU_HT; 283 _cpuFeatures &= ~CPU_HT;
284 } 284 }
285 285
286 char buf[256]; 286 char buf[256];
287 jio_snprintf(buf, sizeof(buf), "(%u cores per cpu, %u threads per core) family %d model %d stepping %d%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s", 287 jio_snprintf(buf, sizeof(buf), "(%u cores per cpu, %u threads per core) family %d model %d stepping %d%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
288 cores_per_cpu(), threads_per_core(), 288 cores_per_cpu(), threads_per_core(),
289 cpu_family(), _model, _stepping, 289 cpu_family(), _model, _stepping,
290 (supports_cmov() ? ", cmov" : ""), 290 (supports_cmov() ? ", cmov" : ""),
291 (supports_cmpxchg8() ? ", cx8" : ""), 291 (supports_cmpxchg8() ? ", cx8" : ""),
292 (supports_fxsr() ? ", fxsr" : ""), 292 (supports_fxsr() ? ", fxsr" : ""),
299 (supports_sse4_2() ? ", sse4.2" : ""), 299 (supports_sse4_2() ? ", sse4.2" : ""),
300 (supports_popcnt() ? ", popcnt" : ""), 300 (supports_popcnt() ? ", popcnt" : ""),
301 (supports_mmx_ext() ? ", mmxext" : ""), 301 (supports_mmx_ext() ? ", mmxext" : ""),
302 (supports_3dnow() ? ", 3dnow" : ""), 302 (supports_3dnow() ? ", 3dnow" : ""),
303 (supports_3dnow2() ? ", 3dnowext" : ""), 303 (supports_3dnow2() ? ", 3dnowext" : ""),
304 (supports_lzcnt() ? ", lzcnt": ""),
304 (supports_sse4a() ? ", sse4a": ""), 305 (supports_sse4a() ? ", sse4a": ""),
305 (supports_ht() ? ", ht": "")); 306 (supports_ht() ? ", ht": ""));
306 _features_str = strdup(buf); 307 _features_str = strdup(buf);
307 308
308 // UseSSE is set to the smaller of what hardware supports and what 309 // UseSSE is set to the smaller of what hardware supports and what
360 if( FLAG_IS_DEFAULT(UseXmmI2D) ) { 361 if( FLAG_IS_DEFAULT(UseXmmI2D) ) {
361 if( supports_sse4a() ) { 362 if( supports_sse4a() ) {
362 UseXmmI2D = true; 363 UseXmmI2D = true;
363 } else { 364 } else {
364 UseXmmI2D = false; 365 UseXmmI2D = false;
366 }
367 }
368
369 // Use count leading zeros count instruction if available.
370 if (supports_lzcnt()) {
371 if (FLAG_IS_DEFAULT(UseCountLeadingZerosInstruction)) {
372 UseCountLeadingZerosInstruction = true;
365 } 373 }
366 } 374 }
367 } 375 }
368 376
369 if( is_intel() ) { // Intel cpus specific settings 377 if( is_intel() ) { // Intel cpus specific settings