[X86] Add 'mmx' to all CPUs that have a version of 'sse' and weren't (details)
[X86] Add 'mmx' to all CPUs that have a version of 'sse' and weren't already enabling '3dnow' All SSE capable CPUs have MMX. 3dnow implicitly enables MMX. We have code that detects if sse is enabled and implicitly enables MMX unless -mno-mmx is passed. So in most cases we were already enabling MMX if march passed a CPU that supported SSE. The exception to this is if you pass -march for a cpu supports SSE and also pass -mno-sse. We should still enable MMX since its part of the CPU capability.