AMD or Intel
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What if the underlying API retrieved the information from the registry?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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To know what is there, in PROCESSOR_ARCHITECTURE and PROCESSOR_IDENTIFIER from
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environmentwhen machine has AMD processor. -
What if the underlying API retrieved the information from the registry?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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To know from registry if the machine has AMD or Intel processor. I guess is possible that.
OK, last try: what actual problem are you trying to resolve? Knowing whether it is AMD or Intel will not make any difference to the execution of your application, so I can only assume that you have found some other issue which you are keeping secret from us.
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Is there any reliable location in windows registry that tell if the architecture of the machine is AMD or Intel ? If there is, where is this location ? I know this location:
HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0
and
Identifierkey, but my machine is Intel ... and I don't know what would be this value on AMD case ... is this a reliable location ? P.S. Also, I know that I could find here:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
PROCESSOR_ARCHITECTUREhas AMD64 value, even if I have Intel machine ...You can find the vendor identifier with [CPUID](https://docs.microsoft.com/en-us/cpp/intrinsics/cpuid-cpuidex?view=vs-2019). The same mechanism can be used to find out what features the CPU supports, which is normally more useful than merely knowing the vendor, obviously it depends on what you want.
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OK, last try: what actual problem are you trying to resolve? Knowing whether it is AMD or Intel will not make any difference to the execution of your application, so I can only assume that you have found some other issue which you are keeping secret from us.
Richard, I am sorry if I was evasive ... Thank you for your patience. I am working on some code which execute some depending of what kind of processor:
BOOL bIsIntel = FALSE;
SYSTEM_INFO si;
GetSystemInfo(&si);
bIsIntel = (si.wProcessorArchitecture == xxx);
if(bIsIntel)
{
// execute some code (I cannot write here what kind of code)
}
else
{
// execute else code
}Furthermore, the code is critical as speed of execution. So, I noticed that
GetSystemInfois taking a time, specially on older machines. So, I intend to retrieve from registry if the machine is AMD or Intel. That is all. I am not hiding anything. If I omitting anything, please tell me, and I will write here. P.S. I don't have any AMD machine, or my colleagues ... if I would, I had tested myself. -
Richard, I am sorry if I was evasive ... Thank you for your patience. I am working on some code which execute some depending of what kind of processor:
BOOL bIsIntel = FALSE;
SYSTEM_INFO si;
GetSystemInfo(&si);
bIsIntel = (si.wProcessorArchitecture == xxx);
if(bIsIntel)
{
// execute some code (I cannot write here what kind of code)
}
else
{
// execute else code
}Furthermore, the code is critical as speed of execution. So, I noticed that
GetSystemInfois taking a time, specially on older machines. So, I intend to retrieve from registry if the machine is AMD or Intel. That is all. I am not hiding anything. If I omitting anything, please tell me, and I will write here. P.S. I don't have any AMD machine, or my colleagues ... if I would, I had tested myself._Flaviu wrote:
I noticed that
GetSystemInfois taking a timeThat is most likely because it has to go to the registry to get the information. You have placed that code in the wrong place. It should be called once at the beginning of the program to set a global or class variable that can then be tested at processor speed. However, the chances of you being able to adjust the speed of your code at the point you show is not very likely. The compiler will optimise any code as much as possible, and whichever processor executes that code will further optimise it through the use of its own pipelining mechanism. Your time would be better spent working on real problems.
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Is there any reliable location in windows registry that tell if the architecture of the machine is AMD or Intel ? If there is, where is this location ? I know this location:
HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0
and
Identifierkey, but my machine is Intel ... and I don't know what would be this value on AMD case ... is this a reliable location ? P.S. Also, I know that I could find here:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
PROCESSOR_ARCHITECTUREhas AMD64 value, even if I have Intel machine ...1. As someone already mentioned, the CPUID instruction gives you this information. It may be called using compiler intrinsics (#include <intrin.h>) on the Microsoft compiler. See [here](https://en.wikipedia.org/wiki/CPUID) for fuller documentation. Pay attention to the EAX=0 function (Get Manufacturer ID). 2. It appears that the same information may be found in the Registry at HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.
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1. As someone already mentioned, the CPUID instruction gives you this information. It may be called using compiler intrinsics (#include <intrin.h>) on the Microsoft compiler. See [here](https://en.wikipedia.org/wiki/CPUID) for fuller documentation. Pay attention to the EAX=0 function (Get Manufacturer ID). 2. It appears that the same information may be found in the Registry at HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.
-
Richard, I am sorry if I was evasive ... Thank you for your patience. I am working on some code which execute some depending of what kind of processor:
BOOL bIsIntel = FALSE;
SYSTEM_INFO si;
GetSystemInfo(&si);
bIsIntel = (si.wProcessorArchitecture == xxx);
if(bIsIntel)
{
// execute some code (I cannot write here what kind of code)
}
else
{
// execute else code
}Furthermore, the code is critical as speed of execution. So, I noticed that
GetSystemInfois taking a time, specially on older machines. So, I intend to retrieve from registry if the machine is AMD or Intel. That is all. I am not hiding anything. If I omitting anything, please tell me, and I will write here. P.S. I don't have any AMD machine, or my colleagues ... if I would, I had tested myself.One way would be to run a registry-watching program (e.g., Process Explorer) while this piece of code executes. Then you can see what key(s) are being read.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
-
One way would be to run a registry-watching program (e.g., Process Explorer) while this piece of code executes. Then you can see what key(s) are being read.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles