T hi s d o es n ot c h a n g e e xi st in g based on SSA . Packages using cgo may now include Fortran source files (in addition to C, C+ +, Objective C, and SWIG), although the Go bindings must still use C language APIs. The new subcommand “ go tool dist list ” prints all supported operating system/architecture pairs.
b e h a vi o ur . 1. 8 - 1. 8. 7 201 7/0 2/1 6 When e x pl ic itl y c o n v er ti n g a v al u e fr o m o n e st ru ct ty p e to a n ot h er , as of For 64-bit x86 systems, the following instructions have been added: VBROADCASTSD , BROADCASTSS , MOVDDUP , MOVSHDUP , MOVSLDUP , VMOVDDUP , VMOVSHDUP , and VMOVSLDUP . Garbage collection pauses should be significantly shorter than they were in Go 1.7, usually under 100 microseconds and often as low as 10 microseconds. See the document on eliminating stop-the-world stack re-scanning for details. The overhead of deferred function calls has been reduced by about half. The overhead of calls from Go into C has been reduced by about half.
G o 1. 8 th e ta gs ar e ig n or e d. T h us t w o st ru ct s th at di ff er o nl y in th ei r ta gs m a y b e c o n v er te d
fr o m o n e to th e ot h er . 1. 9 - 1. 9. 7 201 7/0 8/2 4 Go n o w su p p or ts ty p e al ia se s. Force th e in te r m e di at e ro u n di n g The Go compiler now supports compiling a package's functions in parallel, taking advantage of multiple cores.
in fl o at in g- p oi nt ar it h m et ic . 1. 10 - 1. 10 .3 201 8/0 2/1 6 A c or n er ca se in v ol vi n g sh ift s of u nt y p e d c o ns ta nt s h as b ee For the X86 64-bit port, the assembler now supports 359 new instructions, including the full AVX, AVX2, BMI, BMI2, F16C, FMA3, SSE2, SSE3, SSSE3, SSE4.1, and SSE4.2 extension sets. The assembler also no longer implements MOVL $0, AX as an XORL instruction, to avoid clearing the condition flags unexpectedly.
n cl ar ifi e d. The gr a m m ar fo r m et h o d e x pr es si o ns h as b ee n u p d at e d to re la x th e sy nt a x to al
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