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Gcc march vs mtune

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. gcc -march=native -Q -v test. 11 Dec 2010 gcc version 4. e. If you used -mtune vs mcpu it worked on GCC and performance/size was similar. 29 Sep 2012 -mtune=native causes the compiler to auto-detect the CPU of the build computer. configurations compiled with - march=core2 -mtune=core2; all other gcc versions compiled with  Dec 11, 2010 gcc version 4. Using -march=native will enable all  In contrast to -mtune= cpu-type , which merely tunes the generated code for the specified cpu-type , -march= cpu-type allows GCC to generate code that may not   Feb 5, 2014 Re: [ARM Documentation] Clarify -mcpu, -mtune, -march. Then I benchmarked my bulldozer: mtune=generic vs. conf file since I upgraded GCC a few GCC passed -march=k8 and -mtune=k8 automagically. -mspe: Specifying this option tells GCC to generate code that uses the SPE The same values for cpu-type are used for both the -mtune and -mcpu options. 0 20101204 (experimental) (GCC). c -o test Using built-in specs. 9 and later and Intel compilers (icc, icpc , ifort) gcc -march=sandybridge -mtune=haswell -o example example. Invocation: current-gcc -O3 -mfpmath=sse -mssse3 -march=core2 -mtune=core2  3 Sep 2016 So to have a fair comparison you should compare with "icc -xHost" vs. ). mtune would override  To get more details, including march and mtune values, two When this flag is used, GCC will attempt to detect the processor and  Using -mtune=native will produce code optimized for the local machine under the constraints of the selected instruction set. This is a general question about compiling code for new RPI2 I wish to compile myself  These are just some of the parameters used by GCC to make its . c. 6. 11 May 2012 If you use -march then GCC will be free to generate instructions that work on the specified CPU, but not on (typically) earlier CPUs in the  -mcpu unfortunately has different semantics for different targets. Gnu compilers ( gcc, g++, gfortran ) versions 4. Compile CFLAGS += -Os -mthumb-interwork -march=armv5te \ -D__ARM__ 28 ноя 2012 Большинство GCC компиляторов для x86 (базовый для 64 битного Linux) добавляет: “-mtune=generic -march=x86-64” к заданным  31 Jan 2014 I recently discovered that there is a somewhat noticeable difference in flags added to gcc when comparing *-mtune=native* and  compiling kernel: -mcpu=cortex-a15 vs -march=armv7ve? I'm compiling an Android kernel for my Xperia Z using Linaro GCC 4. Mar 9, 2009 icc still wins, but gcc 4. Heterogeneous clusters; Build environment vs hardcoding in build scripts for toolchains using the GCC compilers, --march=native will be used (see . march=native. "gcc -march=native -mtune=native". c -march=rv64imafdc -mabi=lp64d -o- -S the floating-point registers used by the ABI ( ilp32 vs ilp32f vs ilp32d ). 7. 23 Feb 2004 I compiled OpenSSL with -march=i386 and -march=i686 (the the -mcpu flag has actually been deprecated on x86 GCC in favor of -mtune . Using -march=native will enable all  5 Feb 2014 Re: [ARM Documentation] Clarify -mcpu, -mtune, -march. 4-svn is a contender. tl;dr Understand -march vs. echo | arm-linux-gnueabi- gcc -march=armv7-a -mcpu=cortex-a8 -xc - :1:0: warning: switch  Baseline: -Os -pipe -mips32r2 -mtune=mips32r2 -fno-caller-saves (OpenWrt default) Test 1: -O3 -pipe -march=24kc -mtune=24kc -fno-caller-saves Test 2: -Os -pipe vs. 26 Sep 2012 Most of GCC compilers for x86 (default in 64 bits Linux) add: "-mtune=generic -march=x86-64" to command line options, as were configured  29 Oct 2014 -march=native is very good if you only plan to run your code on a explicitly, GCC will usually automatically apply -mtune=generic Any specific architecture you'll compile for might break on an older or different (AMD vs. mtune would override  Using -mtune=native will produce code optimized for the local machine under the constraints of the selected instruction set. Oct 30, 2014 1, gcc -march=native -mtune=native -mtune=native will “tune” the optimized code to run best for the current . In addition  14 Aug 2017 riscv64-unknown-elf-gcc test. the Intel and GCC compilers: --optarch='Intel:xHost;GCC:march=x86-64 -mtune=generic' . You're suppose to use -march and -mtune instead. To get more details, including march and mtune values, two When this flag is used, GCC will attempt to detect the processor and  Now after some years and reading more about GCC I am not sure if you really should set march and mtune together (i. Fri Feb 06, 2015 11:54 am. From: James Greenhalgh <james dot greenhalgh at arm dot com>; To: Ramana  22 Jan 2007 Some might've noticed that the check-cpu script in the MySQL BUILD directory does not always succeed in detecting the right processor: 30 Jan 2014 I recently discovered that there is a somewhat noticeable difference in flags added to gcc when comparing -mtune=native and -march=native. Also, there are more aggressive  May 11, 2012 If you use -march then GCC will be free to generate instructions that work on the specified CPU, but not on (typically) earlier CPUs in the  May 11, 2012 GCC: how is march different from mtune ? If you use -mtune , then the from one version of GCC to -march=X , as - mtune=X is implied). From: James Greenhalgh ; To: Ramana  Jan 22, 2007 Some might've noticed that the check-cpu script in the MySQL BUILD directory does not always succeed in detecting the right processor: Aug 14, 2017 riscv64-unknown-elf-gcc test. 9 and later and Intel compilers (icc , icpc , ifort) gcc -march=sandybridge -mtune=haswell -o example example. Now after some years and reading more about GCC I am not sure if you really should set march and mtune together (i. It's deprecated for x86 (being a synonym for -mtune ) but not for ARM, where it's a sum of -march  30 Oct 2014 1, gcc -march=native -mtune=native -mtune=native will “tune” the optimized code to run best for the current . arm-poky-linux-gnueabi-gcc -march=armv7-a - mthumb-interwork -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9  28 ноя 2012 Большинство GCC компиляторов для x86 (базовый для 64 битного Linux) добавляет: “-mtune=generic -march=x86-64” к заданным . -mcpu has been deprecated by the GCC folk. baseline -3,5% +7,1% +14,6% -16,1% +18,3% +19,1% +12,0% +12,1 % +12 I guess it requires GCC 4. For example, if GCC is configured for i686-pc-linux-gnu then The choices for cpu-type are the same as for -march. 1_final or later (so the current  run the output file (hello). the Intel and GCC compilers: --optarch='Intel:xHost;GCC:march=x86-64 -mtune=generic' . Based on the use of -mcpu and -mtune together in the  27 Jan 2014 + +@item -mtune=@var{name} +@opindex mtune +This option specifies the name of the target ARM processor for +which GCC should tune  RPI2: proper -march and -mtune GCC flags. GCC options: (-m64) vs (-march=native) vs (-march=core2) -- Which one(s) -march=XXX implies -mtune=XXX w) gcc -march=native -m64 I've had "-mtune=generic" in my makepkg. 9. -mcpu implies -mtune, but will also cause the compiler to emit instructions specific to the target processor. Invocation: current-gcc -O3 - mfpmath=sse -mssse3 -march=core2 -mtune=core2  Oct 18, 2010 Trying mtune instead of mcpu seems to work okay
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Gcc march vs mtune

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. gcc -march=native -Q -v test. 11 Dec 2010 gcc version 4. e. If you used -mtune vs mcpu it worked on GCC and performance/size was similar. 29 Sep 2012 -mtune=native causes the compiler to auto-detect the CPU of the build computer. configurations compiled with - march=core2 -mtune=core2; all other gcc versions compiled with  Dec 11, 2010 gcc version 4. Using -march=native will enable all  In contrast to -mtune= cpu-type , which merely tunes the generated code for the specified cpu-type , -march= cpu-type allows GCC to generate code that may not   Feb 5, 2014 Re: [ARM Documentation] Clarify -mcpu, -mtune, -march. Then I benchmarked my bulldozer: mtune=generic vs. conf file since I upgraded GCC a few GCC passed -march=k8 and -mtune=k8 automagically. -mspe: Specifying this option tells GCC to generate code that uses the SPE The same values for cpu-type are used for both the -mtune and -mcpu options. 0 20101204 (experimental) (GCC). c -o test Using built-in specs. 9 and later and Intel compilers (icc, icpc , ifort) gcc -march=sandybridge -mtune=haswell -o example example. Invocation: current-gcc -O3 -mfpmath=sse -mssse3 -march=core2 -mtune=core2  3 Sep 2016 So to have a fair comparison you should compare with "icc -xHost" vs. ). mtune would override  To get more details, including march and mtune values, two When this flag is used, GCC will attempt to detect the processor and  Using -mtune=native will produce code optimized for the local machine under the constraints of the selected instruction set. This is a general question about compiling code for new RPI2 I wish to compile myself  These are just some of the parameters used by GCC to make its . c. 6. 11 May 2012 If you use -march then GCC will be free to generate instructions that work on the specified CPU, but not on (typically) earlier CPUs in the  -mcpu unfortunately has different semantics for different targets. Gnu compilers ( gcc, g++, gfortran ) versions 4. Compile CFLAGS += -Os -mthumb-interwork -march=armv5te \ -D__ARM__ 28 ноя 2012 Большинство GCC компиляторов для x86 (базовый для 64 битного Linux) добавляет: “-mtune=generic -march=x86-64” к заданным  31 Jan 2014 I recently discovered that there is a somewhat noticeable difference in flags added to gcc when comparing *-mtune=native* and  compiling kernel: -mcpu=cortex-a15 vs -march=armv7ve? I'm compiling an Android kernel for my Xperia Z using Linaro GCC 4. Mar 9, 2009 icc still wins, but gcc 4. Heterogeneous clusters; Build environment vs hardcoding in build scripts for toolchains using the GCC compilers, --march=native will be used (see . march=native. "gcc -march=native -mtune=native". c -march=rv64imafdc -mabi=lp64d -o- -S the floating-point registers used by the ABI ( ilp32 vs ilp32f vs ilp32d ). 7. 23 Feb 2004 I compiled OpenSSL with -march=i386 and -march=i686 (the the -mcpu flag has actually been deprecated on x86 GCC in favor of -mtune . Using -march=native will enable all  5 Feb 2014 Re: [ARM Documentation] Clarify -mcpu, -mtune, -march. 4-svn is a contender. tl;dr Understand -march vs. echo | arm-linux-gnueabi- gcc -march=armv7-a -mcpu=cortex-a8 -xc - :1:0: warning: switch  Baseline: -Os -pipe -mips32r2 -mtune=mips32r2 -fno-caller-saves (OpenWrt default) Test 1: -O3 -pipe -march=24kc -mtune=24kc -fno-caller-saves Test 2: -Os -pipe vs. 26 Sep 2012 Most of GCC compilers for x86 (default in 64 bits Linux) add: "-mtune=generic -march=x86-64" to command line options, as were configured  29 Oct 2014 -march=native is very good if you only plan to run your code on a explicitly, GCC will usually automatically apply -mtune=generic Any specific architecture you'll compile for might break on an older or different (AMD vs. mtune would override  Using -mtune=native will produce code optimized for the local machine under the constraints of the selected instruction set. Oct 30, 2014 1, gcc -march=native -mtune=native -mtune=native will “tune” the optimized code to run best for the current . In addition  14 Aug 2017 riscv64-unknown-elf-gcc test. the Intel and GCC compilers: --optarch='Intel:xHost;GCC:march=x86-64 -mtune=generic' . You're suppose to use -march and -mtune instead. To get more details, including march and mtune values, two When this flag is used, GCC will attempt to detect the processor and  Now after some years and reading more about GCC I am not sure if you really should set march and mtune together (i. Fri Feb 06, 2015 11:54 am. From: James Greenhalgh <james dot greenhalgh at arm dot com>; To: Ramana  22 Jan 2007 Some might've noticed that the check-cpu script in the MySQL BUILD directory does not always succeed in detecting the right processor: 30 Jan 2014 I recently discovered that there is a somewhat noticeable difference in flags added to gcc when comparing -mtune=native and -march=native. Also, there are more aggressive  May 11, 2012 If you use -march then GCC will be free to generate instructions that work on the specified CPU, but not on (typically) earlier CPUs in the  May 11, 2012 GCC: how is march different from mtune ? If you use -mtune , then the from one version of GCC to -march=X , as - mtune=X is implied). From: James Greenhalgh ; To: Ramana  Jan 22, 2007 Some might've noticed that the check-cpu script in the MySQL BUILD directory does not always succeed in detecting the right processor: Aug 14, 2017 riscv64-unknown-elf-gcc test. 9 and later and Intel compilers (icc , icpc , ifort) gcc -march=sandybridge -mtune=haswell -o example example. Now after some years and reading more about GCC I am not sure if you really should set march and mtune together (i. It's deprecated for x86 (being a synonym for -mtune ) but not for ARM, where it's a sum of -march  30 Oct 2014 1, gcc -march=native -mtune=native -mtune=native will “tune” the optimized code to run best for the current . arm-poky-linux-gnueabi-gcc -march=armv7-a - mthumb-interwork -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9  28 ноя 2012 Большинство GCC компиляторов для x86 (базовый для 64 битного Linux) добавляет: “-mtune=generic -march=x86-64” к заданным . -mcpu has been deprecated by the GCC folk. baseline -3,5% +7,1% +14,6% -16,1% +18,3% +19,1% +12,0% +12,1 % +12 I guess it requires GCC 4. For example, if GCC is configured for i686-pc-linux-gnu then The choices for cpu-type are the same as for -march. 1_final or later (so the current  run the output file (hello). the Intel and GCC compilers: --optarch='Intel:xHost;GCC:march=x86-64 -mtune=generic' . Based on the use of -mcpu and -mtune together in the  27 Jan 2014 + +@item -mtune=@var{name} +@opindex mtune +This option specifies the name of the target ARM processor for +which GCC should tune  RPI2: proper -march and -mtune GCC flags. GCC options: (-m64) vs (-march=native) vs (-march=core2) -- Which one(s) -march=XXX implies -mtune=XXX w) gcc -march=native -m64 I've had "-mtune=generic" in my makepkg. 9. -mcpu implies -mtune, but will also cause the compiler to emit instructions specific to the target processor. Invocation: current-gcc -O3 - mfpmath=sse -mssse3 -march=core2 -mtune=core2  Oct 18, 2010 Trying mtune instead of mcpu seems to work okay