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[dev.ssa] cmd/compile: rewrite user nil check as OpIsNonNil

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Rewite user nil checks as OpIsNonNil so our nil check elimination pass
can take advantage and remove redundant checks.

With make.bash this removes 10% more nilchecks (34110 vs 31088).

Change-Id: Ifb01d1b6d2d759f5e2a5aaa0470e1d5a2a680212
Reviewed-on: https://go-review.googlesource.com/14321
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Todd Neal 2015-08-30 21:19:20 -05:00
parent 617e892b87
commit ec8a597cd2
6 changed files with 136 additions and 9 deletions
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6
src/cmd/compile/internal/ssa/gen/genericOps.go
View file

@ -313,9 +313,9 @@ var genericOps = []opData{
{name: "Cvt64Fto32F"},
// Automatically inserted safety checks
{name: "IsNonNil"}, // arg0 != nil
{name: "IsInBounds"}, // 0 <= arg0 < arg1
{name: "IsSliceInBounds"}, // 0 <= arg0 <= arg1
{name: "IsNonNil", typ: "Bool"}, // arg0 != nil
{name: "IsInBounds", typ: "Bool"}, // 0 <= arg0 < arg1
{name: "IsSliceInBounds", typ: "Bool"}, // 0 <= arg0 <= arg1
// Pseudo-ops
{name: "PanicNilCheck"}, // trigger a dereference fault; arg0=nil ptr, arg1=mem, returns mem