Testing GCC optimization flags (Himeno)
GCC optimization comparison


gcc_o0: 

	Processor: AMD E-450 APU @ 1.65GHz (2 Cores), Motherboard: ASUS K73BR v1.0, Chipset: AMD Family 14h Root Complex, Memory: 4096MB, Disk: 320GB Western Digital WD3200BPVT-8, Graphics: ASUS AMD Radeon HD 6400M/7400M 1024MB, Audio: AMD SBx00 Azalia, Network: Realtek RTL8111/8168/8411 + Qualcomm Atheros AR9285 Wireless

	OS: Arch rolling, Kernel: 3.16.6-2-ck (x86_64), Desktop: KDE Frameworks 5, Display Driver: radeon 7.5.0, Compiler: GCC 4.9.1 20140903 + Clang 3.5.0 + LLVM 3.5.0, File-System: btrfs, Screen Resolution: 1600x900

gcc_O1: 

	Processor: AMD E-450 APU @ 1.65GHz (2 Cores), Motherboard: ASUS K73BR v1.0, Chipset: AMD Family 14h Root Complex, Memory: 4096MB, Disk: 320GB Western Digital WD3200BPVT-8, Graphics: ASUS AMD Radeon HD 6400M/7400M 1024MB, Audio: AMD SBx00 Azalia, Network: Realtek RTL8111/8168/8411 + Qualcomm Atheros AR9285 Wireless

	OS: Arch rolling, Kernel: 3.16.6-2-ck (x86_64), Desktop: KDE Frameworks 5, Display Driver: radeon 7.5.0, Compiler: GCC 4.9.1 20140903 + Clang 3.5.0 + LLVM 3.5.0, File-System: btrfs, Screen Resolution: 1600x900

gcc_O2: 

	Processor: AMD E-450 APU @ 1.65GHz (2 Cores), Motherboard: ASUS K73BR v1.0, Chipset: AMD Family 14h Root Complex, Memory: 4096MB, Disk: 320GB Western Digital WD3200BPVT-8, Graphics: ASUS AMD Radeon HD 6400M/7400M 1024MB, Audio: AMD SBx00 Azalia, Network: Realtek RTL8111/8168/8411 + Qualcomm Atheros AR9285 Wireless

	OS: Arch rolling, Kernel: 3.16.6-2-ck (x86_64), Desktop: KDE Frameworks 5, Display Driver: radeon 7.5.0, Compiler: GCC 4.9.1 20140903 + Clang 3.5.0 + LLVM 3.5.0, File-System: btrfs, Screen Resolution: 1600x900

gcc_O3: 

	Processor: AMD E-450 APU @ 1.65GHz (2 Cores), Motherboard: ASUS K73BR v1.0, Chipset: AMD Family 14h Root Complex, Memory: 4096MB, Disk: 320GB Western Digital WD3200BPVT-8, Graphics: ASUS AMD Radeon HD 6400M/7400M 1024MB, Audio: AMD SBx00 Azalia, Network: Realtek RTL8111/8168/8411 + Qualcomm Atheros AR9285 Wireless

	OS: Arch rolling, Kernel: 3.16.6-2-ck (x86_64), Desktop: KDE Frameworks 5, Display Driver: radeon 7.5.0, Compiler: GCC 4.9.1 20140903 + Clang 3.5.0 + LLVM 3.5.0, File-System: btrfs, Screen Resolution: 1600x900

gcc_Os: 

	Processor: AMD E-450 APU @ 1.65GHz (2 Cores), Motherboard: ASUS K73BR v1.0, Chipset: AMD Family 14h Root Complex, Memory: 4096MB, Disk: 320GB Western Digital WD3200BPVT-8, Graphics: ASUS AMD Radeon HD 6400M/7400M 1024MB, Audio: AMD SBx00 Azalia, Network: Realtek RTL8111/8168/8411 + Qualcomm Atheros AR9285 Wireless

	OS: Arch rolling, Kernel: 3.16.6-2-ck (x86_64), Desktop: KDE Frameworks 5, Display Driver: radeon 7.5.0, Compiler: GCC 4.9.1 20140903 + Clang 3.5.0 + LLVM 3.5.0, File-System: btrfs, Screen Resolution: 1600x900


Himeno Benchmark 3.0
Poisson Pressure Solver
MFLOPS > Higher Is Better
gcc_o0 . 54.30  |=============
gcc_O1 . 154.75 |======================================
gcc_O2 . 244.52 |=============================================================
gcc_O3 . 249.80 |==============================================================
gcc_Os . 149.61 |=====================================