Hi Andrew, >From your data, it looks the XCode LTO is not enabled correctly for IA32, but >correct for X64. Attachment has my build map files, and below are my build >commands. FYI.
VS2013x86: build -a IA32 -t VS2013x86 -p OvmfPkg\OvmfPkgIa32.dsc -n 5 -m MdeModulePkg\Core\Pei\PeiMain.inf -b RELEASE build -a IA32 -t VS2013x86 -p OvmfPkg\OvmfPkgIa32.dsc -n 5 -m MdeModulePkg\Core\Pei\PeiMain.inf -b DEBUG -DDEBUG_ON_SERIAL_PORT build -a X64 -t VS2013x86 -p OvmfPkg\OvmfPkgX64.dsc -n 5 -m MdeModulePkg\Core\Dxe\DxeMain.inf -b RELEASE build -a X64 -t VS2013x86 -p OvmfPkg\OvmfPkgX64.dsc -n 5 -m MdeModulePkg\Core\Dxe\DxeMain.inf -b DEBUG -DDEBUG_ON_SERIAL_PORT CLANGLTO38: build -a IA32 -t CLANGLTO38 -p OvmfPkg/OvmfPkgIa32.dsc -n 5 -m MdeModulePkg/Core/Pei/PeiMain.inf -b RELEASE build -a IA32 -t CLANGLTO38 -p OvmfPkg/OvmfPkgIa32.dsc -n 5 -m MdeModulePkg/Core/Pei/PeiMain.inf -b DEBUG -DDEBUG_ON_SERIAL_PORT build -a X64 -t CLANGLTO38 -p OvmfPkg/OvmfPkgX64.dsc -n 5 -m MdeModulePkg/Core/Dxe/DxeMain.inf -b RELEASE build -a X64 -t CLANGLTO38 -p OvmfPkg/OvmfPkgX64.dsc -n 5 -m MdeModulePkg/Core/Dxe/DxeMain.inf -b DEBUG -DDEBUG_ON_SERIAL_PORT Steven Shi Intel\SSG\STO\UEFI Firmware Tel: +86 021-61166522 iNet: 821-6522 From: af...@apple.com [mailto:af...@apple.com] Sent: Wednesday, May 11, 2016 2:03 AM To: Shi, Steven <steven....@intel.com> Cc: edk2-devel@lists.01.org Subject: Re: [edk2] edk2 llvm branch On May 10, 2016, at 8:05 AM, Shi, Steven <steven....@intel.com<mailto:steven....@intel.com>> wrote: Hi Andrew, Thank you for the suggestion. I will try your suggestion and response other questions in your email later. I don't have XCODE5 environment, but could do me a favor and let me know what current XCODE5 code size for PeiCore.efi and DxeCore.efi in your side? In my side, as below data show, I see the LTO can bring big code size improvement which is quite important for firmware in many scenarios. I forgot to mention. LTO or not it is good to check to make sure the assembly files are getting dead stripped. For example check to make sure you are not getting all the assembly functions in the BaseLib included in your executable. Some of the assembly is .S and some is .nasm so you may see different behavior depending on which assembler was used. It is also useful to start looking at the smallest PEIM/DXE drivers 1st as it may be easier to spot what is different. Maybe it is also a good idea to enable LTO in XCODE. For Xcode you add -object_path_lto $(DEST_DIR_DEBUG)/$(BASE_NAME).lto to *_XCODE5_*_DLINK_FLAGS. This places the intermediate link code gen in the Build/ director vs. a temp director and is important for source level debugging. To turn LTO on and off you add -flto to *_XCODE5_*_CC_FLAGS . We ended up making LTO a configurable build option, so we control it in the DSC file. git [BuildOptions] !if $(PEI_LTO_ENABLE) XCODE:*_*_IA32_PLATFORM_FLAGS = -flto !endif !if $(DXE_LTO_ENABLE) XCODE:*_*_X64_PLATFORM_FLAGS = -flto !endif I included the Xcode 6.3.2 Numbers: IA32 DEBUG PeiCore.efi on Ovmf build code size example: ToolChainName PeiCore.efi file size VS2013x86: 40KB CLANGLTO38: 42KB Xcode 61K GCCLTO53: 44KB GCC49: 55KB CLANG38: 60KB IA32 RELEASE PeiCore.efi on Ovmf build code size example: ToolChainName PeiCore.efi file size VS2013x86: 20KB GCCLTO53: 23KB CLANGLTO38: 24KB Xcode 31K GCC49: 27KB Clang38: 29KB X64 DEBUG DxeCore.efi on Ovmf build code size example: ToolChainName .efi file size LZMA Compressed size VS2013x86: 137KB 57KB CLANGLTO38: 145KB 61KB Xcode 157K 68K GCCLTO53: 161KB 63KB GCC49: 273KB 69KB CLANG38: 205KB 72KB X64 RELEASE DxeCore.efi on Ovmf build code size example: ToolChainName .efi file size LZMA Compressed size VS2013x86: 95KB 44KB GCCLTO53: 101KB 46KB CLANGLTO38: 107KB 48KB Xcode 104K 49K GCC49: 184KB 52KB CLANG38: 133KB 53KB Can you send my linker map files for VS2013 & CLANGLTO38 off list. Thanks, Andrew Fish Steven Shi Intel\SSG\STO\UEFI Firmware Tel: +86 021-61166522 iNet: 821-6522 > -----Original Message----- > From: af...@apple.com<mailto:af...@apple.com> [mailto:af...@apple.com] > Sent: Tuesday, May 10, 2016 1:12 PM > To: Shi, Steven <steven....@intel.com<mailto:steven....@intel.com>> > Cc: edk2-devel@lists.01.org<mailto:edk2-devel@lists.01.org> > Subject: Re: [edk2] edk2 llvm branch > > _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
