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cmd/compile: simplify converted SSA form for 'if false'

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The goal here is to make it easier for a human to
examine the SSA when a function contains lots of dead code.

No significant compiler metric or generated code differences.

Change-Id: I81915fa4639bc8820cc9a5e45e526687d0d1f57a
Reviewed-on: https://go-review.googlesource.com/c/go/+/221791
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2020-03-02 13:51:20 -08:00
parent b49d8ce2fa
commit 7b0b6c2f7e
1 changed files with 10 additions and 0 deletions
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10
src/cmd/compile/internal/gc/ssa.go
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@ -1274,6 +1274,16 @@ func (s *state) stmt(n *Node) {
s.assign(n.Left, r, deref, skip)
case OIF:
if Isconst(n.Left, CTBOOL) {
s.stmtList(n.Left.Ninit)
if n.Left.Bool() {
s.stmtList(n.Nbody)
} else {
s.stmtList(n.Rlist)
}
break
}
bEnd := s.f.NewBlock(ssa.BlockPlain)
var likely int8
if n.Likely() {