AMD Bulldozer Thread

[Dresdenboy]

The Open64 compiler produces up to 25% faster code as Intel's latest version 12 compilers even
though the intentionally crippled results submitted by Intel run on a 40% higher clocked Bulldozer.....


Open64 4.2.5.2 Compiler suite: (SPEC results submitted by Dell)
2.6 GHz Bulldozer: SPEC_int_rate 134, SPEC_FP_rate 100

Intel Studio XE 12.0.3.176 compilers: (SPEC results submitted by Intel)
3.6 GHz Bulldozer: SPEC_int_rate 115, SPEC_FP_rate 79.8

http://www.spec.org/cpu2006/results/res2011q4/

Hans

Andreas Stiller (ct mag) wrote in his article, that the Intel 12.1 compilers create ~25% faster code (SPECfp_rate2006) compared to 12.0 while still using SSE3. AVX256 doesn't help much. AVX128 might show a better performance by using the 3 operand format (although FP moves are free). FMA4 is not being used as everyone would expect.

On i7-2600K the 12.1 compilers create ~9% faster code in SPECfp vs. 12.0:

Intel Compiler 12.1 results for i7-2600K

Intel Compiler 12.0 results for i7-2600K

Patching the GenuineIntel string and processorfamily in the SPECint executables resulted in a 45% boost in libquantum and ~20% in Xalancmbk according to him.