748aa84424
When a constant can be encoded in a logical instruction (BITCON), do it this way instead of using the constant pool. The BITCON testing code runs faster than table lookup (using map): (on AMD64 machine, with pseudo random input) BenchmarkIsBitcon-4 300000000 4.04 ns/op BenchmarkTable-4 50000000 27.3 ns/op The equivalent C code of BITCON testing is formally verified with model checker CBMC against linear search of the lookup table. Also handle cases when a constant can be encoded in a MOV instruction. In this case, materializa the constant into REGTMP without using the constant pool. When constants need to be added to the constant pool, make sure to check whether it fits in 32-bit. If not, store 64-bit. Both legacy and SSA compiler backends are happy with this. Fixes #16226. Change-Id: I883e3069dee093a1cdc40853c42221a198a152b0 Reviewed-on: https://go-review.googlesource.com/26631 Run-TryBot: Cherry Zhang <cherryyz@google.com> Reviewed-by: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> |
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The Go Programming Language
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Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this file). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install-source.html). You should also add the Go binary directory $GOROOT/bin to your shell's path.
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