Giovanni Bajo 09ea3c08e8 cmd/compile: in prove, fix fence-post implications for unsigned domain ... Fence-post implications of the form "x-1 >= w && x > min ⇒ x > w" were not correctly handling unsigned domain, by always checking signed limits. This bug was uncovered once we taught prove that len(x) is always >= 0 in the signed domain. In the code being miscompiled (s[len(s)-1]), prove checks whether len(s)-1 >= len(s) in the unsigned domain; if it proves that this is always false, it can remove the bound check. Notice that len(s)-1 >= len(s) can be true for len(s) = 0 because of the wrap-around, so this is something prove should not be able to deduce. But because of the bug, the gate condition for the fence-post implication was len(s) > MinInt64 instead of len(s) > 0; that condition would be good in the signed domain but not in the unsigned domain. And since in CL105635 we taught prove that len(s) >= 0, the condition incorrectly triggered (len(s) >= 0 > MinInt64) and things were going downfall. Fixes #27251 Fixes #27289 Change-Id: I3dbcb1955ac5a66a0dcbee500f41e8d219409be5 Reviewed-on: https://go-review.googlesource.com/132495 Reviewed-by: Keith Randall <khr@golang.org>		2018-08-31 08:54:38 +00:00
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bug504.dir	test: add test case that gccgo miscompiled	2017-10-12 19:02:09 +00:00
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issue18911.dir	runtime: slightly better error message for assertion panics with identical looking types	2018-06-05 00:29:50 +00:00
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issue19261.dir	cmd/compile: record InlCost in export data	2017-10-11 23:20:44 +00:00
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issue22877.dir	cmd/compile: make -asmhdr work with type aliases	2017-11-29 20:40:41 +00:00
issue22941.dir	cmd/compile: fix DWARF type symbol buglet	2017-12-01 18:52:50 +00:00
issue22962.dir	cmd/compile: fix bug in DWARF inl handling of unused autos	2017-12-04 18:36:11 +00:00
issue23179.dir	cmd/compile: second attempt at fix for issue 23179	2017-12-20 20:39:16 +00:00
issue24693.dir	cmd/compile: sort method sets using package height	2018-04-10 00:06:06 +00:00
issue24761.dir	cmd/compile: loop to ensure all autogenerated functions are compiled	2018-04-11 23:46:30 +00:00
issue24801.dir	cmd/compile: fix check that ensures main.main is a function	2018-04-10 23:34:12 +00:00
issue25055.dir	cmd/compile: fix "width not calculated" ICE	2018-07-06 20:25:52 +00:00
issue25984.dir	cmd/compile: fix compile failure for lazily resolved shadowed types	2018-06-22 17:57:09 +00:00
issue26341.dir	cmd/compile: fix ICE due to missing inline function body	2018-07-12 00:13:37 +00:00
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bug206.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
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bug248.go	test: eliminate use of Perl in test/fixedbugs/bug248.go	2018-05-26 15:20:42 +00:00
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bug273.go	runtime: use sparse mappings for the heap	2018-02-15 21:12:23 +00:00
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bug289.go	cmd/compile: better error message for assignment mismatches	2017-10-06 16:35:44 +00:00
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bug302.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
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bug328.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
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bug345.go	test: skip test/fixedbugs/bug345.go on windows	2018-06-01 21:46:07 +00:00
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bug388.go	cmd/compile: allow := to shadow dot-imported names	2017-10-05 18:07:37 +00:00
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bug409.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
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bug429_run.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
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bug487.go	cmd/compile: better error message for assignment mismatches	2017-10-06 16:35:44 +00:00
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bug504.go	test: add test case that gccgo miscompiled	2017-10-12 19:02:09 +00:00
bug505.go	test: add type alias test that caused gccgo to crash	2017-10-26 22:52:53 +00:00
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issue4085b.go	cmd/compile: optimize append(x, make([]T, y)...) slice extension	2018-05-06 04:28:23 +00:00
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issue6899.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
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issue7525.go	cmd/compile: silence unnecessary unsafe error	2017-10-24 02:28:02 +00:00
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issue12621.go	test: add test for rounding to positive zero	2018-02-14 20:13:05 +00:00
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issue13265.go	cmd/compile: only support -race and -msan where they work	2018-08-21 03:38:27 +00:00
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issue14006.go	cmd/compile/internal/syntax: consider function nesting for error recovery	2017-10-11 00:29:58 +00:00
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issue14321.go	cmd/compile: better error message when referring to ambiguous method/field	2018-04-10 23:39:13 +00:00
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issue14540.go	cmd/compile: eliminate OXFALL	2017-09-19 18:08:50 +00:00
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issue15091.go	cmd/compile: only support -race and -msan where they work	2018-08-21 03:38:27 +00:00
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issue15548.go
issue15550.go
issue15572.go
issue15585.go
issue15602.go
issue15604.go
issue15611.go
issue15646.go
issue15722.go
issue15733.go
issue15747.go	runtime: remove legacy eager write barrier	2018-02-13 16:34:46 +00:00
issue15747b.go
issue15838.go
issue15895.go
issue15898.go
issue15902.go
issue15920.go
issue15926.go
issue15961.go
issue15975.go
issue15988.go
issue16008.go	cmd/compile: only support -race and -msan where they work	2018-08-21 03:38:27 +00:00
issue16016.go
issue16037_run.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue16095.go
issue16130.go
issue16133.go
issue16193.go
issue16249.go
issue16306.go
issue16317.go
issue16331.go
issue16369.go
issue16428.go
issue16439.go
issue16515.go
issue16616.go
issue16733.go
issue16741.go
issue16760.go
issue16804.go
issue16870.go
issue16948.go
issue16949.go
issue16985.go
issue17005.go
issue17038.go
issue17039.go
issue17111.go
issue17194.go
issue17270.go
issue17318.go
issue17328.go
issue17381.go
issue17449.go	cmd/compile: only support -race and -msan where they work	2018-08-21 03:38:27 +00:00
issue17551.go
issue17588.go
issue17596.go
issue17631.go
issue17640.go
issue17645.go
issue17710.go
issue17752.go
issue17918.go
issue18089.go
issue18092.go
issue18149.go
issue18231.go
issue18331.go
issue18392.go
issue18393.go
issue18410.go
issue18419.go
issue18459.go
issue18595.go
issue18636.go
issue18640.go	cmd/compile: correct alias cycle detection	2018-06-12 18:55:39 +00:00
issue18655.go
issue18661.go
issue18725.go
issue18747.go
issue18808.go
issue18882.go
issue18895.go
issue18906.go
issue18911.go	runtime: slightly better error message for assertion panics with identical looking types	2018-06-05 00:29:50 +00:00
issue18915.go
issue18994.go
issue19012.go
issue19028.go
issue19040.go
issue19056.go
issue19078.go
issue19084.go
issue19137.go	cmd/internal/obj/arm64: fix handling of unaligned offset between 256 and 504	2017-10-05 22:28:17 +00:00
issue19168.go
issue19182.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue19201.go
issue19217.go
issue19246.go
issue19261.go	cmd/compile: record InlCost in export data	2017-10-11 23:20:44 +00:00
issue19275.go
issue19323.go
issue19359.go	cmd/compile: avoid mapaccess at m[k]=append(m[k]..	2018-03-20 01:47:07 +00:00
issue19467.go
issue19482.go
issue19507.go
issue19515.go
issue19548.go
issue19555.go
issue19610.go
issue19632.go
issue19658.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue19667.go
issue19671.go
issue19678.go
issue19679.go
issue19696.go
issue19699.go
issue19699b.go
issue19705.go
issue19710.go
issue19743.go
issue19764.go
issue19783.go
issue19799.go
issue19880.go
issue19911.go
issue19947.go
issue19977.go
issue20029.go
issue20097.go
issue20145.go
issue20162.go
issue20174.go
issue20185.go
issue20227.go
issue20232.go
issue20233.go
issue20245.go
issue20250.go	runtime: remove legacy eager write barrier	2018-02-13 16:34:46 +00:00
issue20298.go
issue20333.go
issue20335.go
issue20415.go
issue20529.go	cmd/compile: add some generic composite type optimizations	2018-05-08 10:31:21 +00:00
issue20530.go
issue20602.go
issue20682.go
issue20739.go	cmd/compile: refactor onebitwalktype1	2017-09-20 18:11:52 +00:00
issue20749.go
issue20780.go	cmd/compile: include callee args section when checking frame too large	2018-06-02 18:00:44 +00:00
issue20789.go
issue20811.go
issue20812.go
issue20813.go
issue20923.go	test: add a test that gccgo miscompiled	2018-02-14 20:13:07 +00:00
issue21048.go
issue21120.go
issue21221.go	cmd/compile: fix constant pointer comparison failure	2018-04-09 23:19:45 +00:00
issue21253.go
issue21256.go	cmd/compile, go/types: error if main.main is not a function	2017-11-22 19:14:31 +00:00
issue21273.go	cmd/compile: avoid spurious errors for invalid map key types	2017-11-02 23:53:38 +00:00
issue21317.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue21655.go	cmd/compile: fix large load/store offsets on 386	2017-12-08 03:53:18 +00:00
issue21687.go
issue21709.go	cmd/compile: fix loop depth of range expression in escape analysis	2017-11-30 13:45:18 +00:00
issue21770.go
issue21808.go
issue21808.out
issue21879.go	cmd/compile: fix stack frame info for calls in receiver slot	2017-09-19 18:35:24 +00:00
issue21879.out	cmd/compile: fix stack frame info for calls in receiver slot	2017-09-19 18:35:24 +00:00
issue21882.go	cmd/compile: fix compiler crash on recursive types	2017-09-18 21:49:43 +00:00
issue21887.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
issue21887.out	cmd/compile: fix print/println when input is uint	2017-09-26 04:08:38 +00:00
issue21963.go	cmd/compile: fix sign-extension merging rules	2017-09-26 16:24:08 +00:00
issue21988.go	cmd/compile: fix invalid switch case value panic	2017-09-24 10:15:52 +00:00
issue22063.go	cmd/compile: fix another invalid switch case panic	2017-09-27 21:19:06 +00:00
issue22076.go	cmd/compile: allow := to shadow dot-imported names	2017-10-05 18:07:37 +00:00
issue22083.go	cmd/compile: fix merge rules for panic calls	2017-10-03 09:27:37 +00:00
issue22164.go	cmd/compile/internal/syntax: better recovery after missing closing parentheses	2017-10-17 01:04:56 +00:00
issue22198.go	cmd/compile: fold constant comparisions into SETxxmem ops.	2017-10-11 18:23:09 +00:00
issue22200.go	cmd/compile: abort earlier if stack frame too large	2017-10-11 18:24:13 +00:00
issue22200b.go	test: skip issue22200b.go on mipsle	2017-10-11 20:37:23 +00:00
issue22305.go	test: add new test that gccgo failed to compile	2018-02-15 03:37:20 +00:00
issue22351.go	cmd/compile: silence unnecessary unsafe error	2017-10-24 02:28:02 +00:00
issue22389.go	cmd/compile: test for omitted ICE diagnostics after normal messages	2017-11-06 08:37:30 +00:00
issue22429.go	cmd/compile: make sure not to use SP as an index register	2017-10-26 02:45:05 +00:00
issue22458.go	cmd/compile: fix runtime.KeepAlive	2017-10-30 19:55:02 +00:00
issue22581.go	cmd/compile/internal/syntax: better syntax errors for typos in if/switch/for headers	2017-11-06 23:17:24 +00:00
issue22605.go	cmd/compile: don't put Noalg types in typelinks	2017-11-07 22:29:48 +00:00
issue22660.go	all: skip unsupported tests for js/wasm	2018-04-30 19:39:18 +00:00
issue22662.go	cmd/compile: track line directives w/ column information	2018-02-26 18:32:03 +00:00
issue22662b.go	all: fix typos detected by github.com/client9/misspell	2018-08-23 15:54:07 +00:00
issue22683.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
issue22683.out	cmd/compile: add test for array decomposition	2017-11-13 20:22:22 +00:00
issue22781.go	cmd/compile: fix mapassign_fast* routines for pointer keys	2017-11-22 04:30:27 +00:00
issue22794.go	cmd/compile: hint on wrong case-field names in composite literals	2017-11-20 20:29:43 +00:00
issue22822.go	cmd/compile: improved error message when calling a shadowed builtin	2018-02-28 19:39:52 +00:00
issue22877.go	cmd/compile: make -asmhdr work with type aliases	2017-11-29 20:40:41 +00:00
issue22881.go	cmd/compile: avoid mapaccess at m[k]=append(m[k]..	2018-03-20 01:47:07 +00:00
issue22904.go	cmd/compile: fix infinite recursion in isdirectiface	2017-11-28 21:58:16 +00:00
issue22941.go	cmd/compile: fix DWARF type symbol buglet	2017-12-01 18:52:50 +00:00
issue22962.go	cmd/compile: fix bug in DWARF inl handling of unused autos	2017-12-04 18:36:11 +00:00
issue23093.go	cmd/compile: remove broken inlining accounting code	2017-12-12 20:26:33 +00:00
issue23094.go	cmd/compile: fix printing of array types in error messages	2018-06-05 00:43:22 +00:00
issue23116.go	cmd/compile: reject type switch with guarded declaration and no cases	2018-03-13 22:02:46 +00:00
issue23179.go	cmd/compile: fix corner case in DWARF inline info generation	2017-12-19 19:00:42 +00:00
issue23188.go	test: add order of evaluation test case that gccgo got wrong	2018-07-10 21:30:26 +00:00
issue23298.go	cmd/compile: allow converting defined string types to []rune	2018-02-15 00:25:21 +00:00
issue23305.go	cmd/compile: disable "redundant zeroextensions" optimization for Select on AMD64	2018-01-02 21:08:35 +00:00
issue23414.go	cmd/compile: fix typechecking of untyped boolean expressions	2018-02-15 01:00:06 +00:00
issue23489.go	test: add test case for incorrect gccgo compilation error	2018-02-14 20:13:22 +00:00
issue23504.go	cmd/compile: reset branch prediction when deleting a branch	2018-02-20 00:56:13 +00:00
issue23521.go	cmd/compile: make DCE remove nodes after terminating if	2018-04-03 15:19:41 +00:00
issue23522.go	cmd/compile: don't let spills clobber arguments	2018-01-23 21:51:55 +00:00
issue23545.go	cmd/compile: make sure alg functions are generated when we call them	2018-07-10 01:20:45 +00:00
issue23546.go	cmd/compile: make sure alg functions are generated when we call them	2018-07-10 01:20:45 +00:00
issue23586.go	cmd/compile/internal/syntax: more tolerant handling of missing function invocation in go/defer	2018-02-15 01:48:16 +00:00
issue23587.go	cmd/compile/internal/syntax: don't assume (operator) ~ means operator ^	2018-02-15 16:41:24 +00:00
issue23609.go	cmd/compile: improve compiler error on embedded structs	2018-03-06 21:06:46 +00:00
issue23664.go	cmd/compile/internal/syntax: better error message for incorrect if/switch header	2018-04-03 21:57:37 +00:00
issue23719.go	cmd/compile: use unsigned loads for multi-element comparisons	2018-02-06 18:24:33 +00:00
issue23732.go	cmd/compile: report the struct type in invalid number of initializer values	2018-02-13 19:42:15 +00:00
issue23812.go	cmd/compile: fix constant folding of right shifts	2018-02-14 00:03:36 +00:00
issue23823.go	cmd/compile: correct alias cycle detection	2018-06-12 18:55:39 +00:00
issue23912.go	test: add test case where gccgo incorrectly rejected aliases	2018-02-20 01:57:14 +00:00
issue24120.go	cmd/compile: fix inlining of constant if statements	2018-02-27 19:27:32 +00:00
issue24159.go	cmd/compile: prevent detection of wrong duplicates	2018-03-07 01:26:00 +00:00
issue24173.go	cmd/compile: fix unexpected type alias crash	2018-02-28 20:18:37 +00:00
issue24187.go	runtime: fix amd64p32 indexbytes in presence of overflow	2018-03-01 16:53:33 +00:00
issue24339.go	cmd/compile: use key position for key:val elements in composite literals	2018-03-13 21:44:12 +00:00
issue24419.go	internal/bytealg: specify argmaps for exported functions	2018-07-10 17:13:53 +00:00
issue24449.go	cmd/compile: mark LAA and LAAG as clobbering flags on s390x	2018-03-20 09:44:50 +00:00
issue24470.go	cmd/compile: better handling of incorrect type switches	2018-04-03 05:34:20 +00:00
issue24503.go	cmd/compile/internal/ssa: handle symbol address comparisons consistently	2018-03-31 21:37:13 +00:00
issue24547.go	cmd/compile: fix method set computation for shadowed methods	2018-03-27 18:56:36 +00:00
issue24651a.go	cmd/compile: only support -race and -msan where they work	2018-08-21 03:38:27 +00:00
issue24651b.go	cmd/compile: conditional on -race, disable inline of go:norace	2018-06-19 20:59:10 +00:00
issue24693.go	cmd/compile: sort method sets using package height	2018-04-10 00:06:06 +00:00
issue24693.out	cmd/compile: sort method sets using package height	2018-04-10 00:06:06 +00:00
issue24761.go	cmd/compile: loop to ensure all autogenerated functions are compiled	2018-04-11 23:46:30 +00:00
issue24763.go	cmd/compile: don't crash in untyped expr to interface conversion	2018-06-28 23:01:22 +00:00
issue24799.go	cmd/compile: generate load without DS relocation for go.string on ppc64le	2018-04-20 16:16:47 +00:00
issue24801.go	cmd/compile: fix check that ensures main.main is a function	2018-04-10 23:34:12 +00:00
issue24817.go	cmd/compile: fix evaluation of "" < s	2018-04-12 19:38:37 +00:00
issue24937.go	cmd/compile: avoid runtime call during switch string(byteslice)	2018-04-21 00:50:50 +00:00
issue24939.go	cmd/compile: correct alias cycle detection	2018-06-12 18:55:39 +00:00
issue25006.go	cmd/compile/internal/ssa: fix endless compile loop on AMD64	2018-04-24 16:20:41 +00:00
issue25055.go	cmd/compile: fix "width not calculated" ICE	2018-07-06 20:25:52 +00:00
issue25101.go	cmd/compile: revert internal parameter rename (from ".anonX" to "") before export	2018-06-05 20:22:07 +00:00
issue25322.go	test: remove rundircmpout and cmpout actions	2018-05-31 17:36:45 +00:00
issue25322.out	cmd/compile: fix zero extend after float->int conversion	2018-05-10 17:32:43 +00:00
issue25507.go	cmd/compile: reject large argument areas	2018-05-29 16:58:05 +00:00
issue25516.go	cmd/compile: update WBLoads during deadcode	2018-05-29 17:45:36 +00:00
issue25727.go	cmd/compile: make case insensitive suggestions aware of package	2018-06-13 23:12:54 +00:00
issue25741.go	cmd/compile: fix OffPtr with negative offset on wasm	2018-06-06 14:40:25 +00:00
issue25776.go	cmd/compile: ensure that operand of ORETURN is not double-walked	2018-06-14 20:08:10 +00:00
issue25958.go	cmd/compile: more accurate position for select case error message	2018-06-19 17:52:23 +00:00
issue25966.go	cmd/compile: fold offset into address on Wasm	2018-06-27 14:30:00 +00:00
issue25984.go	cmd/compile: fix compile failure for lazily resolved shadowed types	2018-06-22 17:57:09 +00:00
issue25993.go	cmd/compile: convert uint32 to int32 in ARM constant folding rules	2018-06-22 16:25:32 +00:00
issue26024.go	cmd/compile: handle degenerate write barrier case	2018-07-12 19:06:09 +00:00
issue26043.go	cmd/compile: avoid remainder in loopbce when increment=0	2018-06-25 20:36:42 +00:00
issue26094.go	runtime: don't say "different packages" if they may not be different	2018-07-11 21:34:05 +00:00
issue26097.go	cmd/compile: mark CMOVLEQF, CMOVWEQF as cloberring AX	2018-06-28 18:39:56 +00:00
issue26105.go	cmd/compile: add LocalAddr that takes SP,mem operands	2018-07-12 18:45:31 +00:00
issue26116.go	cmd/compile: ensure that loop condition is detected correctly	2018-07-09 18:23:39 +00:00
issue26120.go	cmd/compile: check SSAability in handling of INDEX of 1-element array	2018-06-29 12:05:05 +00:00
issue26153.go	cmd/compile: keep autos whose address reaches a phi	2018-07-02 19:43:07 +00:00
issue26163.go	cmd/compile: run generic deadcode in -N mode	2018-07-02 20:53:23 +00:00
issue26248.go	test: add test for gccgo bug #26248	2018-07-10 01:19:37 +00:00
issue26335.go	test: add test case that failed with gccgo	2018-07-11 18:14:35 +00:00
issue26340.go	test: add test of valid code that gccgo failed to compile	2018-07-12 05:29:12 +00:00
issue26341.go	cmd/compile: fix ICE due to missing inline function body	2018-07-12 00:13:37 +00:00
issue26407.go	cmd/compile: keep autos if their address reaches a control value	2018-07-17 14:58:54 +00:00
issue26416.go	cmd/compile: fix crash on invalid struct literal	2018-07-18 20:32:04 +00:00
issue26426.go	cmd/compile: add test for OPmodify ops clobbering flags	2018-07-19 16:24:53 +00:00
issue26438.go	cmd/compile: fix an arm64's comparison bug	2018-07-18 14:15:05 +00:00
issue26495.go	test: add test for gccgo bug #26495	2018-07-20 20:08:15 +00:00
issue27143.go	cmd/compile: prevent overflow in walkinrange	2018-08-26 21:52:27 +00:00
issue27278.go	cmd/compile: count nil check as use in dead auto elim	2018-08-30 02:19:37 +00:00
issue27289.go	cmd/compile: in prove, fix fence-post implications for unsigned domain	2018-08-31 08:54:38 +00:00