OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	02/02/2024 06:09:55 PM	rwxr-xr-x
📄 README.md	8.14 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 TODO	950 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📁 _gen	-	02/02/2024 06:09:55 PM	rwxr-xr-x
📄 addressingmodes.go	24.26 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 allocators.go	7.37 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 bench_test.go	835 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 biasedsparsemap.go	2.67 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 block.go	11.03 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 branchelim.go	12.7 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 branchelim_test.go	5.21 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 cache.go	1.55 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 check.go	17.52 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 checkbce.go	956 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 compile.go	18.66 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 config.go	12.95 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 copyelim.go	1.83 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 copyelim_test.go	1.29 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 critical.go	3.06 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 cse.go	9.63 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 cse_test.go	4.2 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 deadcode.go	9.25 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 deadcode_test.go	3.49 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 deadstore.go	10.42 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 deadstore_test.go	4.09 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 debug.go	56.4 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 debug_lines_test.go	8.44 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 debug_test.go	28.64 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 decompose.go	13.42 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 dom.go	7.35 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 dom_test.go	13.34 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 expand_calls.go	31.88 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 export_test.go	3.04 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 flagalloc.go	6.72 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 flags_amd64_test.s	533 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 flags_arm64_test.s	699 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 flags_test.go	2.47 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 fmahash_test.go	1.82 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 func.go	25.07 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 func_test.go	13.05 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 fuse.go	9.03 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 fuse_branchredirect.go	3.22 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 fuse_comparisons.go	4.04 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 fuse_test.go	7.37 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 generate.go	225 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 html.go	34.85 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 id.go	576 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 layout.go	4.97 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 lca.go	3.77 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 lca_test.go	1.65 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 likelyadjust.go	15.43 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 location.go	3.06 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 loopbce.go	11.81 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 loopreschedchecks.go	15.96 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 looprotate.go	2.68 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 lower.go	1.66 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 magic.go	15.77 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 magic_test.go	9.1 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 memcombine.go	18.44 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 nilcheck.go	11.3 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 nilcheck_test.go	12.33 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 numberlines.go	7.82 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 op.go	18.67 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 opGen.go	1.03 MB	02/02/2024 06:09:55 PM	rw-r--r--
📄 opt.go	309 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 passbm_test.go	3.14 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 phielim.go	1.48 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 phiopt.go	8.08 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 poset.go	37.21 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 poset_test.go	18.14 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 print.go	3.86 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 prove.go	49.44 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 regalloc.go	87.22 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 regalloc_test.go	6.31 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewrite.go	60.26 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewrite386.go	262.37 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewrite386splitload.go	4.04 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteAMD64.go	713.19 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteAMD64latelower.go	2.58 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteAMD64splitload.go	21.4 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteARM.go	486.78 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteARM64.go	623.93 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteARM64latelower.go	6.88 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteCond_test.go	11.12 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteLOONG64.go	195.82 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteMIPS.go	176.61 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteMIPS64.go	211.6 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewritePPC64.go	371.03 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewritePPC64latelower.go	14.78 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteRISCV64.go	203.12 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteRISCV64latelower.go	5.08 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteS390X.go	395.13 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewriteWasm.go	108.58 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewrite_test.go	6.91 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewritedec.go	24.94 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewritedec64.go	65.29 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 rewritegeneric.go	796.35 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 sccp.go	17.56 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 sccp_test.go	3.57 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 schedule.go	16.42 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 schedule_test.go	5.57 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 shift_test.go	4.05 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 shortcircuit.go	12.63 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 shortcircuit_test.go	1.31 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 sizeof_test.go	855 bytes	02/02/2024 06:09:55 PM	rw-r--r--
📄 softfloat.go	1.99 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 sparsemap.go	1.9 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 sparsemappos.go	1.7 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 sparseset.go	1.54 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 sparsetree.go	8.05 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 stackalloc.go	12.56 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 stmtlines_test.go	3.46 KB	02/02/2024 06:09:55 PM	rw-r--r--
📁 testdata	-	02/02/2024 06:09:55 PM	rwxr-xr-x
📄 tighten.go	7.67 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 trim.go	4.25 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 tuple.go	1.97 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 value.go	16.67 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 writebarrier.go	23.5 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 writebarrier_test.go	1.75 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 xposmap.go	3.29 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 zcse.go	2.07 KB	02/02/2024 06:09:55 PM	rw-r--r--
📄 zeroextension_test.go	1.66 KB	02/02/2024 06:09:55 PM	rw-r--r--

Name

Size

Modified

Perms

📁 ..

02/02/2024 06:09:55 PM

rwxr-xr-x

📄 README.md

8.14 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 TODO

950 bytes

02/02/2024 06:09:55 PM

rw-r--r--

📁 _gen

02/02/2024 06:09:55 PM

rwxr-xr-x

📄 addressingmodes.go

24.26 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 allocators.go

7.37 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 bench_test.go

835 bytes

02/02/2024 06:09:55 PM

rw-r--r--

📄 biasedsparsemap.go

2.67 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 block.go

11.03 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 branchelim.go

12.7 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 branchelim_test.go

5.21 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 cache.go

1.55 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 check.go

17.52 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 checkbce.go

956 bytes

02/02/2024 06:09:55 PM

rw-r--r--

📄 compile.go

18.66 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 config.go

12.95 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 copyelim.go

1.83 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 copyelim_test.go

1.29 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 critical.go

3.06 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 cse.go

9.63 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 cse_test.go

4.2 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 deadcode.go

9.25 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 deadcode_test.go

3.49 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 deadstore.go

10.42 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 deadstore_test.go

4.09 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 debug.go

56.4 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 debug_lines_test.go

8.44 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 debug_test.go

28.64 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 decompose.go

13.42 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 dom.go

7.35 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 dom_test.go

13.34 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 expand_calls.go

31.88 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 export_test.go

3.04 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 flagalloc.go

6.72 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 flags_amd64_test.s

533 bytes

02/02/2024 06:09:55 PM

rw-r--r--

📄 flags_arm64_test.s

699 bytes

02/02/2024 06:09:55 PM

rw-r--r--

📄 flags_test.go

2.47 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 fmahash_test.go

1.82 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 func.go

25.07 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 func_test.go

13.05 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 fuse.go

9.03 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 fuse_branchredirect.go

3.22 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 fuse_comparisons.go

4.04 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 fuse_test.go

7.37 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 generate.go

225 bytes

02/02/2024 06:09:55 PM

rw-r--r--

📄 html.go

34.85 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 id.go

576 bytes

02/02/2024 06:09:55 PM

rw-r--r--

📄 layout.go

4.97 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 lca.go

3.77 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 lca_test.go

1.65 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 likelyadjust.go

15.43 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 location.go

3.06 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 loopbce.go

11.81 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 loopreschedchecks.go

15.96 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 looprotate.go

2.68 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 lower.go

1.66 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 magic.go

15.77 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 magic_test.go

9.1 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 memcombine.go

18.44 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 nilcheck.go

11.3 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 nilcheck_test.go

12.33 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 numberlines.go

7.82 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 op.go

18.67 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 opGen.go

1.03 MB

02/02/2024 06:09:55 PM

rw-r--r--

📄 opt.go

309 bytes

02/02/2024 06:09:55 PM

rw-r--r--

📄 passbm_test.go

3.14 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 phielim.go

1.48 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 phiopt.go

8.08 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 poset.go

37.21 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 poset_test.go

18.14 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 print.go

3.86 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 prove.go

49.44 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 regalloc.go

87.22 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 regalloc_test.go

6.31 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewrite.go

60.26 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewrite386.go

262.37 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewrite386splitload.go

4.04 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteAMD64.go

713.19 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteAMD64latelower.go

2.58 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteAMD64splitload.go

21.4 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteARM.go

486.78 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteARM64.go

623.93 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteARM64latelower.go

6.88 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteCond_test.go

11.12 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteLOONG64.go

195.82 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteMIPS.go

176.61 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteMIPS64.go

211.6 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewritePPC64.go

371.03 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewritePPC64latelower.go

14.78 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteRISCV64.go

203.12 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteRISCV64latelower.go

5.08 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteS390X.go

395.13 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewriteWasm.go

108.58 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewrite_test.go

6.91 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewritedec.go

24.94 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewritedec64.go

65.29 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 rewritegeneric.go

796.35 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 sccp.go

17.56 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 sccp_test.go

3.57 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 schedule.go

16.42 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 schedule_test.go

5.57 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 shift_test.go

4.05 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 shortcircuit.go

12.63 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 shortcircuit_test.go

1.31 KB

02/02/2024 06:09:55 PM

rw-r--r--

📄 sizeof_test.go

855 bytes

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📄 softfloat.go

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📄 sparsemap.go

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📄 sparsemappos.go

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📄 sparseset.go

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📄 sparsetree.go

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📄 stackalloc.go

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📄 stmtlines_test.go

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📁 testdata

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📄 tighten.go

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📄 trim.go

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📄 tuple.go

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📄 value.go

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📄 writebarrier.go

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📄 writebarrier_test.go

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📄 xposmap.go

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📄 zcse.go

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📄 zeroextension_test.go

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Editing: flagalloc.go

package ssa

// flagalloc allocates the flag register among all the flag-generating
// instructions. Flag values are recomputed if they need to be
// spilled/restored.
func flagalloc(f *Func) {
	// Compute the in-register flag value we want at the end of
	// each block. This is basically a best-effort live variable
	// analysis, so it can be much simpler than a full analysis.
	end := f.Cache.allocValueSlice(f.NumBlocks())
	defer f.Cache.freeValueSlice(end)
	po := f.postorder()
	for n := 0; n < 2; n++ {
		for _, b := range po {
			// Walk values backwards to figure out what flag
			// value we want in the flag register at the start
			// of the block.
			var flag *Value
			for _, c := range b.ControlValues() {
				if c.Type.IsFlags() {
					if flag != nil {
						panic("cannot have multiple controls using flags")
					}
					flag = c
				}
			}
			if flag == nil {
				flag = end[b.ID]
			}
			for j := len(b.Values) - 1; j >= 0; j-- {
				v := b.Values[j]
				if v == flag {
					flag = nil
				}
				if v.clobbersFlags() {
					flag = nil
				}
				for _, a := range v.Args {
					if a.Type.IsFlags() {
						flag = a
					}
				}
			}
			if flag != nil {
				for _, e := range b.Preds {
					p := e.b
					end[p.ID] = flag
				}
			}
		}
	}

// For blocks which have a flags control value, that's the only value
	// we can leave in the flags register at the end of the block. (There
	// is no place to put a flag regeneration instruction.)
	for _, b := range f.Blocks {
		if b.Kind == BlockDefer {
			// Defer blocks internally use/clobber the flags value.
			end[b.ID] = nil
			continue
		}
		for _, v := range b.ControlValues() {
			if v.Type.IsFlags() && end[b.ID] != v {
				end[b.ID] = nil
			}
		}
	}

// Compute which flags values will need to be spilled.
	spill := map[ID]bool{}
	for _, b := range f.Blocks {
		var flag *Value
		if len(b.Preds) > 0 {
			flag = end[b.Preds[0].b.ID]
		}
		for _, v := range b.Values {
			for _, a := range v.Args {
				if !a.Type.IsFlags() {
					continue
				}
				if a == flag {
					continue
				}
				// a will need to be restored here.
				spill[a.ID] = true
				flag = a
			}
			if v.clobbersFlags() {
				flag = nil
			}
			if v.Type.IsFlags() {
				flag = v
			}
		}
		for _, v := range b.ControlValues() {
			if v != flag && v.Type.IsFlags() {
				spill[v.ID] = true
			}
		}
		if v := end[b.ID]; v != nil && v != flag {
			spill[v.ID] = true
		}
	}

// Add flag spill and recomputation where they are needed.
	var remove []*Value // values that should be checked for possible removal
	var oldSched []*Value
	for _, b := range f.Blocks {
		oldSched = append(oldSched[:0], b.Values...)
		b.Values = b.Values[:0]
		// The current live flag value (the pre-flagalloc copy).
		var flag *Value
		if len(b.Preds) > 0 {
			flag = end[b.Preds[0].b.ID]
			// Note: the following condition depends on the lack of critical edges.
			for _, e := range b.Preds[1:] {
				p := e.b
				if end[p.ID] != flag {
					f.Fatalf("live flag in %s's predecessors not consistent", b)
				}
			}
		}
		for _, v := range oldSched {
			if v.Op == OpPhi && v.Type.IsFlags() {
				f.Fatalf("phi of flags not supported: %s", v.LongString())
			}

// If v will be spilled, and v uses memory, then we must split it
			// into a load + a flag generator.
			if spill[v.ID] && v.MemoryArg() != nil {
				remove = append(remove, v)
				if !f.Config.splitLoad(v) {
					f.Fatalf("can't split flag generator: %s", v.LongString())
				}
			}

// Make sure any flag arg of v is in the flags register.
			// If not, recompute it.
			for i, a := range v.Args {
				if !a.Type.IsFlags() {
					continue
				}
				if a == flag {
					continue
				}
				// Recalculate a
				c := copyFlags(a, b)
				// Update v.
				v.SetArg(i, c)
				// Remember the most-recently computed flag value.
				flag = a
			}
			// Issue v.
			b.Values = append(b.Values, v)
			if v.clobbersFlags() {
				flag = nil
			}
			if v.Type.IsFlags() {
				flag = v
			}
		}
		for i, v := range b.ControlValues() {
			if v != flag && v.Type.IsFlags() {
				// Recalculate control value.
				remove = append(remove, v)
				c := copyFlags(v, b)
				b.ReplaceControl(i, c)
				flag = v
			}
		}
		if v := end[b.ID]; v != nil && v != flag {
			// Need to reissue flag generator for use by
			// subsequent blocks.
			remove = append(remove, v)
			copyFlags(v, b)
			// Note: this flag generator is not properly linked up
			// with the flag users. This breaks the SSA representation.
			// We could fix up the users with another pass, but for now
			// we'll just leave it. (Regalloc has the same issue for
			// standard regs, and it runs next.)
			// For this reason, take care not to add this flag
			// generator to the remove list.
		}
	}

// Save live flag state for later.
	for _, b := range f.Blocks {
		b.FlagsLiveAtEnd = end[b.ID] != nil
	}

// Remove any now-dead values.
	// The number of values to remove is likely small,
	// and removing them requires processing all values in a block,
	// so minimize the number of blocks that we touch.

// Shrink remove to contain only dead values, and clobber those dead values.
	for i := 0; i < len(remove); i++ {
		v := remove[i]
		if v.Uses == 0 {
			v.reset(OpInvalid)
			continue
		}
		// Remove v.
		last := len(remove) - 1
		remove[i] = remove[last]
		remove[last] = nil
		remove = remove[:last]
		i-- // reprocess value at i
	}

if len(remove) == 0 {
		return
	}

removeBlocks := f.newSparseSet(f.NumBlocks())
	defer f.retSparseSet(removeBlocks)
	for _, v := range remove {
		removeBlocks.add(v.Block.ID)
	}

// Process affected blocks, preserving value order.
	for _, b := range f.Blocks {
		if !removeBlocks.contains(b.ID) {
			continue
		}
		i := 0
		for j := 0; j < len(b.Values); j++ {
			v := b.Values[j]
			if v.Op == OpInvalid {
				continue
			}
			b.Values[i] = v
			i++
		}
		b.truncateValues(i)
	}
}

func (v *Value) clobbersFlags() bool {
	if opcodeTable[v.Op].clobberFlags {
		return true
	}
	if v.Type.IsTuple() && (v.Type.FieldType(0).IsFlags() || v.Type.FieldType(1).IsFlags()) {
		// This case handles the possibility where a flag value is generated but never used.
		// In that case, there's no corresponding Select to overwrite the flags value,
		// so we must consider flags clobbered by the tuple-generating instruction.
		return true
	}
	return false
}

// copyFlags copies v (flag generator) into b, returns the copy.
// If v's arg is also flags, copy recursively.
func copyFlags(v *Value, b *Block) *Value {
	flagsArgs := make(map[int]*Value)
	for i, a := range v.Args {
		if a.Type.IsFlags() || a.Type.IsTuple() {
			flagsArgs[i] = copyFlags(a, b)
		}
	}
	c := v.copyInto(b)
	for i, a := range flagsArgs {
		c.SetArg(i, a)
	}
	return c
}