Mercurial > hg > truffle
comparison src/cpu/x86/vm/vm_version_x86.cpp @ 3787:6ae7a1561b53
6990015: Incorrect Icache line size is used for 64 bit x86
Summary: correct Icache::line_size for x64 and add verification code into vm_version_x86.
Reviewed-by: never, phh
author | kvn |
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date | Tue, 28 Jun 2011 15:04:39 -0700 |
parents | 2a34a4fbc52c |
children | 1af104d6cf99 3be7439273c5 |
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3786:498c6cf70f7e | 3787:6ae7a1561b53 |
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319 } | 319 } |
320 // in 64 bit the use of SSE2 is the minimum | 320 // in 64 bit the use of SSE2 is the minimum |
321 if (UseSSE < 2) UseSSE = 2; | 321 if (UseSSE < 2) UseSSE = 2; |
322 #endif | 322 #endif |
323 | 323 |
324 #ifdef AMD64 | |
325 // flush_icache_stub have to be generated first. | |
326 // That is why Icache line size is hard coded in ICache class, | |
327 // see icache_x86.hpp. It is also the reason why we can't use | |
328 // clflush instruction in 32-bit VM since it could be running | |
329 // on CPU which does not support it. | |
330 // | |
331 // The only thing we can do is to verify that flushed | |
332 // ICache::line_size has correct value. | |
333 guarantee(_cpuid_info.std_cpuid1_edx.bits.clflush != 0, "clflush is not supported"); | |
334 // clflush_size is size in quadwords (8 bytes). | |
335 guarantee(_cpuid_info.std_cpuid1_ebx.bits.clflush_size == 8, "such clflush size is not supported"); | |
336 #endif | |
337 | |
324 // If the OS doesn't support SSE, we can't use this feature even if the HW does | 338 // If the OS doesn't support SSE, we can't use this feature even if the HW does |
325 if (!os::supports_sse()) | 339 if (!os::supports_sse()) |
326 _cpuFeatures &= ~(CPU_SSE|CPU_SSE2|CPU_SSE3|CPU_SSSE3|CPU_SSE4A|CPU_SSE4_1|CPU_SSE4_2); | 340 _cpuFeatures &= ~(CPU_SSE|CPU_SSE2|CPU_SSE3|CPU_SSSE3|CPU_SSE4A|CPU_SSE4_1|CPU_SSE4_2); |
327 | 341 |
328 if (UseSSE < 4) { | 342 if (UseSSE < 4) { |