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[dev.ssa] cmd/compile: everything is live and reachable after regalloc

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This CL makes function printing and HTML generation
accurate after regalloc.

Prior to this CL, text and HTML function outputs
showed live values and blocks as dead.

Change-Id: I70669cd8641af841447fc5d2ecbd754b281356f0
Reviewed-on: https://go-review.googlesource.com/13812
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2015-08-21 10:15:15 -07:00
parent 8f51ae8ba5
commit 7393c24877
1 changed files with 14 additions and 0 deletions
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14
src/cmd/compile/internal/ssa/deadcode.go
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@ -6,6 +6,20 @@ package ssa
// findlive returns the reachable blocks and live values in f.
func findlive(f *Func) (reachable []bool, live []bool) {
// After regalloc, consider all blocks and values to be reachable and live.
// See the comment at the top of regalloc.go and in deadcode for details.
if f.RegAlloc != nil {
reachable = make([]bool, f.NumBlocks())
for i := range reachable {
reachable[i] = true
}
live = make([]bool, f.NumValues())
for i := range live {
live[i] = true
}
return reachable, live
}
// Find all reachable basic blocks.
reachable = make([]bool, f.NumBlocks())
reachable[f.Entry.ID] = true