5b14c7b324
When instructions add, and, or, xor, and movd have constant operands in some cases more instructions are generated than necessary by the assembler. This adds more opcode/operand combinations to the optab and improves the code generation for the cases where the size and sign of the constant allows the use of 1 instructions instead of 2. Example of previous code: oris r3, r0, 0 ori r3, r3, 65533 now: ori r3, r0, 65533 This does not significantly reduce the overall binary size because the improvement depends on the constant value. Some procedures show a 1-2% reduction in size. This improvement could also be significant in cases where the extra instructions occur in a critical loop. Testcase ppc64enc.s was added to cmd/asm/internal/asm/testdata with the variations affected by this change. Updates #23845 Change-Id: I7fdf2320c95815d99f2755ba77d0c6921cd7fad7 Reviewed-on: https://go-review.googlesource.com/95135 Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com> |
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