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When they're in the 0F opcode space, swapping their source operands may allow switching from 3-byte to 2-byte VEX prefix encoding. Note that NaN behavior precludes us doing so for many packed and scalar floating point insns; such an optimization would need to be done by the compiler instead in this case, when it knows that NaN-s have undefined behavior anyway. While for explicitly specified AVX/AVX2 insns the optimization (for now at least) gets done only for -O2 and -Os, it is utilized by default in SSE2AVX mode, as there we're re-writing the programmer's specified insns anyway. Rather than introducing a new attribute flag, the change re-uses one which so far was meaningful only for EVEX-encoded insns. |
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| c-aarch64.texi | ||
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| c-avr.texi | ||
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| c-cris.texi | ||
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| c-hppa.texi | ||
| c-i386.texi | ||
| c-ia64.texi | ||
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| fdl.texi | ||
| h8.texi | ||
| internals.texi | ||
| Makefile.am | ||
| Makefile.in | ||