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zdjones 576442b27b cmd/compile: preempt repeated checks for the zero constant in prove 
Prove requires access to a zero-valued constant in multiple heavily-used
code paths. Currently, prove is checking for the existence of the constant on
every iteration of these paths, and creating it if not found.

This CL preempts all of these checks by finding or creating the zero constant
Value, just once, when the factsTable is initialised on entry to prove(). The
Method used to initialise the zero constant, func.ConstInt64(), finds an
existing constant if present, or creates one in the entry block otherwise.

Fixes #31141

Change-Id: Ic9a2fd9d79b67025e24d4483f6e87cf8213ead24
Reviewed-on: https://go-review.googlesource.com/c/go/+/170118
Reviewed-by: Giovanni Bajo <rasky@develer.com>
Run-TryBot: Giovanni Bajo <rasky@develer.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-29 23:05:45 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api text/scanner: don't liberally consume (invalid) floats or underbars 2019-02-20 20:23:28 +00:00
doc cmd/compile: add sign-extension operators on wasm 2019-03-28 20:23:05 +00:00
lib/time time: read 64-bit data if available 2019-02-26 23:10:35 +00:00
misc cmd/link: permit duplicate weak symbols 2019-03-29 17:46:01 +00:00
src cmd/compile: preempt repeated checks for the zero constant in prove 2019-03-29 23:05:45 +00:00
test cmd/compile: enhance induction variable detection for unrolled loops 2019-03-29 20:08:07 +00:00
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README.md

The Go Programming Language

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