Commits · 463858e6ff8cacd3bf2dafebe56272f8a863d959 · go / golang

11 Aug, 2015 4 commits

[dev.ssa] cmd/compile: make failed nil checks panic · 463858e6

Josh Bleecher Snyder authored Aug 11, 2015

Introduce pseudo-ops PanicMem and LoweredPanicMem.
PanicMem could be rewritten directly into MOVL
during lowering, but then we couldn't log nil checks.

With this change, runnable nil check tests pass:

GOSSAPKG=main go run run.go -- nil*.go

Compiler output nil check tests fail:

GOSSAPKG=p go run run.go -- nil*.go

This is due to several factors:

* SSA has improved elimination of unnecessary nil checks.
* SSA is missing elimination of implicit nil checks.
* SSA is missing extra logging about why nil checks were removed.

I'm not sure how best to resolve these failures,
particularly in a world in which the two backends
will live side by side for some time.
For now, punt on the problem.

Change-Id: Ib2ca6824551671f92e0e1800b036f5ca0905e2a3
Reviewed-on: https://go-review.googlesource.com/13474Reviewed-by: Keith Randall <khr@golang.org>

463858e6

[dev.ssa] cmd/compile: fix function call memory accounting · 2af06480

Josh Bleecher Snyder authored Aug 11, 2015

We were not recording function calls as
changing the state of memory.

As a result, the scheduler was not aware that
storing values to the stack in order to make a
function call must happen *after* retrieving
results from the stack from a just-completed
function call.

This fixes the container/ring tests.

This was my first experience debugging an issue
using the HTML output. I'm feeling quite
pleased with it.

Change-Id: I9e8276846be9fd7a60422911b11816c5175e3d0a
Reviewed-on: https://go-review.googlesource.com/13560Reviewed-by: Keith Randall <khr@golang.org>

2af06480

[dev.ssa] cmd/compile: add support for LROT, and tests · 40aba8c4

David Chase authored Aug 06, 2015

Hardcoded the limit on constants only allowed.

Change-Id: Idb9b07b4871db7a752a79e492671e9b41207b956
Reviewed-on: https://go-review.googlesource.com/13257Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

40aba8c4

[dev.ssa] cmd/compile/ssa: don't nil check phis with non-nil arguments · e0e55662

Todd Neal authored Aug 07, 2015

Move the known-non-nil scan outside the work loop to resolve an issue
with values that were declared outside the block being operated on.
Also consider phis whose arguments are all non-nil, as non-nil.

Change-Id: I4d5b840042de9eb181f2cb918f36913fb5d517a2
Reviewed-on: https://go-review.googlesource.com/13441Reviewed-by: Keith Randall <khr@golang.org>

e0e55662

10 Aug, 2015 3 commits

[dev.ssa] cmd/compile/internal/ssa: Update TODO list · 9787ba43

Keith Randall authored Aug 10, 2015

Change-Id: Ibcd4c6984c8728fd9ab76e0c7df555984deaf281
Reviewed-on: https://go-review.googlesource.com/13471Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

9787ba43

[dev.ssa] cmd/compile: detect rewrite loops of length > 1 · baf2c3ec

Josh Bleecher Snyder authored Aug 10, 2015

Use a version of Floyd's cycle finding algorithm,
but advance by 1 and 1/2 steps per cycle rather
than by 1 and 2. It is simpler and should be cheaper
in the normal, acyclic case.

This should fix the 386 and arm builds,
which are currently hung.

Change-Id: If8bd443011b28a5ecb004a549239991d3dfc862b
Reviewed-on: https://go-review.googlesource.com/13473Reviewed-by: Keith Randall <khr@golang.org>

baf2c3ec

[dev.ssa] cmd/compile/internal/ssa: enforce load-store ordering in scheduler · e98edc88

Keith Randall authored Aug 10, 2015

We must make sure that all loads that use a store are scheduled
before the next store. Add additional dependency edges to the
value graph to enforce this constraint.

Change-Id: Iab83644f68bc4c30637085b82ca7467b9d5513a5
Reviewed-on: https://go-review.googlesource.com/13470Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

e98edc88

07 Aug, 2015 1 commit

[dev.ssa] cmd/compile: add simplifying block rewrite rules · 0d910180

Josh Bleecher Snyder authored Aug 07, 2015

Change-Id: Ia946c259628f84dc7031171456563975d2ad5ea9
Reviewed-on: https://go-review.googlesource.com/13381Reviewed-by: Keith Randall <khr@golang.org>

0d910180

06 Aug, 2015 12 commits

[dev.ssa] cmd/compile/ssa: don't perform nilcheck on OpAddr/OpAddPtr values · b14b8d6b

Todd Neal authored Aug 03, 2015

Don't nilcheck values that were constructed as a result of OpAddr or
OpAddPtr.

Change-Id: I38053e905d1b76a2a64e77f84e444d38a5217108
Reviewed-on: https://go-review.googlesource.com/13256Reviewed-by: David Chase <drchase@google.com>

b14b8d6b

[dev.ssa] cmd/compile: copy values during rewrites · 0fb818a4

Josh Bleecher Snyder authored Aug 05, 2015

Rather than require an explicit Copy on the RHS of rewrite rules,
use rulegen magic to add it.

The advantages to handling this in rulegen are:

* simpler rules
* harder to accidentally miss a Copy

Change-Id: I46853bade83bdf517eee9495bf5a553175277b53
Reviewed-on: https://go-review.googlesource.com/13242Reviewed-by: Keith Randall <khr@golang.org>

0fb818a4

[dev.ssa] cmd/compile/internal/ssa/gen: generate better code when right-shifting with a constant. · d2150c83

Alexandru Moșoi authored Aug 06, 2015

The lowering rules were missing the non-64 bit case.

SBBLcarrymask can be folded to a int32 integer whose
type has a smaller bit size. Without the new AND rules
the following would be generated:

    v19 = MOVLconst <uint8> [-1] : SI
    v20 = ANDB <uint8> v18 v19 : DI

which is obviously a NOP.

Fixes #12022

Change-Id: I5f4209f78edc0f118e5b9b2908739f09cefebca4
Reviewed-on: https://go-review.googlesource.com/13301Reviewed-by: Keith Randall <khr@golang.org>

d2150c83

[dev.ssa] cmd/compile: handle phi control values · ca088cf4

Josh Bleecher Snyder authored Aug 05, 2015

Tests courtesy of Todd Neal.

Change-Id: If657c7c7d3cd1ce01e9d9ad79eb6b2110230c0f9
Reviewed-on: https://go-review.googlesource.com/13267Reviewed-by: Todd Neal <todd@tneal.org>
Reviewed-by: Keith Randall <khr@golang.org>

ca088cf4

[dev.ssa] cmd/compile/internal/ssa: more checks on ssa structure · cfd8dfaa

Keith Randall authored Aug 05, 2015

Make sure all referenced Blocks and Values are really there.
Fix deadcode to generate SSA graphs that pass this new test.

Change-Id: Ib002ce20e33490eb8c919bd189d209f769d61517
Reviewed-on: https://go-review.googlesource.com/13147Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

cfd8dfaa

[dev.ssa] cmd/compile: enforce that all phis are first during regalloc · ddeee0ee

Josh Bleecher Snyder authored Aug 05, 2015

Change-Id: I035708f5d0659b3deef00808d35e1cc8a80215e0
Reviewed-on: https://go-review.googlesource.com/13243Reviewed-by: Keith Randall <khr@golang.org>

ddeee0ee

[dev.ssa] cmd/compile: schedule phi control values first · f1401f1a

Josh Bleecher Snyder authored Aug 05, 2015

Change-Id: I684440dc316625d5572cc12179adbc206e306429
Reviewed-on: https://go-review.googlesource.com/13263Reviewed-by: Keith Randall <khr@golang.org>

f1401f1a

[dev.ssa] cmd/compile: tidy up register setup · cd0cb0a9

Josh Bleecher Snyder authored Aug 06, 2015

No functional changes.
The intent is just to make this
easier to read and maintain.

Change-Id: Iec207546482cd62bcb22eaae8efe5be6c4f15378
Reviewed-on: https://go-review.googlesource.com/13284Reviewed-by: Keith Randall <khr@golang.org>

cd0cb0a9

[dev.ssa] cmd/compile: improve error message for phi location mismatch · 55845232

Josh Bleecher Snyder authored Aug 05, 2015

Change-Id: I402841743fcdc287631646039eb149f5cfdf886c
Reviewed-on: https://go-review.googlesource.com/13269Reviewed-by: Keith Randall <khr@golang.org>

55845232

[dev.ssa] cmd/compile: don't move OpSP and OpSB values · 6548b63d

Josh Bleecher Snyder authored Aug 05, 2015

regalloc expects to find all OpSP and OpSB values
in the entry block.

There is no value to moving them; don't.

Change-Id: I775198f03ce7420348721ffc5e7d2bab065465b1
Reviewed-on: https://go-review.googlesource.com/13266Reviewed-by: Keith Randall <khr@golang.org>

6548b63d

[dev.ssa] cmd/compile: provide better errors for regnum and localOffset failures · e1395498

Josh Bleecher Snyder authored Aug 05, 2015

Change-Id: I2667b0923e17df7cbf08e34ebec1b69a0f2f02b2
Reviewed-on: https://go-review.googlesource.com/13265Reviewed-by: Keith Randall <khr@golang.org>

e1395498

[dev.ssa] cmd/compile: respect phi values in tighten · e5fe33e5

Josh Bleecher Snyder authored Aug 05, 2015

Given (say)

b1: <- b2 b3
  v1 = Phi <t> v2 v3
b2:
  v2 = ...
b3:
  ...

tighten will move v2 to b1, since it is only used in b1.

This is wrong; v2 needs to be evaluated before entering b1.
Fix it.

Change-Id: I2cc3b30e3ffd221cf594e36cec534dfd9cf3c6a7
Reviewed-on: https://go-review.googlesource.com/13264Reviewed-by: Keith Randall <khr@golang.org>

e5fe33e5

05 Aug, 2015 1 commit

[dev.ssa] cmd/compile: add SSA pass to move values closer to uses · f91ff1a5

Josh Bleecher Snyder authored Aug 04, 2015

Even this very simple, restricted initial implementation helps.

While running make.bash, it moves 84437 values
to new, closer homes.

As a concrete example:

func f_ssa(i, j int, b bool) int {
	if !b {
		return 0
	}
	return i + j
}

It cuts off one stack slot and two instructions:

Before:

"".f_ssa t=1 size=96 value=0 args=0x20 locals=0x18
	0x0000 00000 (x.go:3)	TEXT	"".f_ssa(SB), $24-32
	0x0000 00000 (x.go:3)	SUBQ	$24, SP
	0x0004 00004 (x.go:3)	FUNCDATA	$0, "".gcargs·0(SB)
	0x0004 00004 (x.go:3)	FUNCDATA	$1, "".gclocals·1(SB)
	0x0004 00004 (x.go:5)	MOVQ	$0, AX
	0x0006 00006 (x.go:3)	MOVQ	32(SP), CX
	0x000b 00011 (x.go:3)	MOVQ	40(SP), DX
	0x0010 00016 (x.go:3)	LEAQ	48(SP), BX
	0x0015 00021 (x.go:3)	MOVB	(BX), BPB
	0x0018 00024 (x.go:3)	MOVQ	$0, SI
	0x001a 00026 (x.go:3)	MOVQ	SI, 56(SP)
	0x001f 00031 (x.go:3)	TESTB	BPB, BPB
	0x0022 00034 (x.go:5)	MOVQ	AX, (SP)
	0x0026 00038 (x.go:3)	MOVQ	CX, 8(SP)
	0x002b 00043 (x.go:3)	MOVQ	DX, 16(SP)
	0x0030 00048 (x.go:4)	JEQ	74
	0x0032 00050 (x.go:3)	MOVQ	8(SP), AX
	0x0037 00055 (x.go:3)	MOVQ	16(SP), CX
	0x003c 00060 (x.go:7)	LEAQ	(AX)(CX*1), DX
	0x0040 00064 (x.go:7)	MOVQ	DX, 56(SP)
	0x0045 00069 (x.go:3)	ADDQ	$24, SP
	0x0049 00073 (x.go:3)	RET
	0x004a 00074 (x.go:5)	MOVQ	(SP), AX
	0x004e 00078 (x.go:5)	MOVQ	AX, 56(SP)
	0x0053 00083 (x.go:3)	JMP	69

After:

"".f_ssa t=1 size=80 value=0 args=0x20 locals=0x10
	0x0000 00000 (x.go:3)	TEXT	"".f_ssa(SB), $16-32
	0x0000 00000 (x.go:3)	SUBQ	$16, SP
	0x0004 00004 (x.go:3)	FUNCDATA	$0, "".gcargs·0(SB)
	0x0004 00004 (x.go:3)	FUNCDATA	$1, "".gclocals·1(SB)
	0x0004 00004 (x.go:3)	MOVQ	32(SP), AX
	0x0009 00009 (x.go:3)	MOVQ	24(SP), CX
	0x000e 00014 (x.go:3)	LEAQ	40(SP), DX
	0x0013 00019 (x.go:3)	MOVB	(DX), BL
	0x0015 00021 (x.go:3)	MOVQ	$0, BP
	0x0017 00023 (x.go:3)	MOVQ	BP, 48(SP)
	0x001c 00028 (x.go:3)	TESTB	BL, BL
	0x001e 00030 (x.go:3)	MOVQ	AX, (SP)
	0x0022 00034 (x.go:3)	MOVQ	CX, 8(SP)
	0x0027 00039 (x.go:4)	JEQ	64
	0x0029 00041 (x.go:3)	MOVQ	8(SP), AX
	0x002e 00046 (x.go:3)	MOVQ	(SP), CX
	0x0032 00050 (x.go:7)	LEAQ	(AX)(CX*1), DX
	0x0036 00054 (x.go:7)	MOVQ	DX, 48(SP)
	0x003b 00059 (x.go:3)	ADDQ	$16, SP
	0x003f 00063 (x.go:3)	RET
	0x0040 00064 (x.go:5)	MOVQ	$0, AX
	0x0042 00066 (x.go:5)	MOVQ	AX, 48(SP)
	0x0047 00071 (x.go:3)	JMP	59

Of course, the old backend is still well ahead:

"".f_ssa t=1 size=48 value=0 args=0x20 locals=0x0
	0x0000 00000 (x.go:3)	TEXT	"".f_ssa(SB), $0-32
	0x0000 00000 (x.go:3)	NOP
	0x0000 00000 (x.go:3)	NOP
	0x0000 00000 (x.go:3)	FUNCDATA	$0, gclocals·a8eabfc4a4514ed6b3b0c61e9680e440(SB)
	0x0000 00000 (x.go:3)	FUNCDATA	$1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
	0x0000 00000 (x.go:4)	CMPB	"".b+24(FP), $0
	0x0005 00005 (x.go:4)	JNE	17
	0x0007 00007 (x.go:5)	MOVQ	$0, "".~r3+32(FP)
	0x0010 00016 (x.go:5)	RET
	0x0011 00017 (x.go:7)	MOVQ	"".i+8(FP), BX
	0x0016 00022 (x.go:7)	MOVQ	"".j+16(FP), BP
	0x001b 00027 (x.go:7)	ADDQ	BP, BX
	0x001e 00030 (x.go:7)	MOVQ	BX, "".~r3+32(FP)
	0x0023 00035 (x.go:7)	RET

Some regalloc improvements should help considerably.

Change-Id: I95bb5dd83e56afd70ae4e983f1d32dffd0c3d46a
Reviewed-on: https://go-review.googlesource.com/13142Reviewed-by: Keith Randall <khr@golang.org>

f91ff1a5

04 Aug, 2015 9 commits

[dev.ssa] cmd/compile/internal/ssa: implement ITAB · d1c15a0e

Keith Randall authored Aug 04, 2015

Implement ITAB, selecting the itable field of an interface.

Soften the lowering check to allow lowerings that leave
generic but dead ops behind. (The ITAB lowering does this.)

Change-Id: Icc84961dd4060d143602f001311aa1d8be0d7fc0
Reviewed-on: https://go-review.googlesource.com/13144Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

d1c15a0e

[dev.ssa] cmd/compile: make GOSSAFUNC trigger logging · 9495e45c

Josh Bleecher Snyder authored Aug 04, 2015

I find myself always adding this in temporarily.
Make it permanent.

Change-Id: I1646b3930a07d0ea01840736ccd449b7fd24f06e
Reviewed-on: https://go-review.googlesource.com/13141Reviewed-by: Keith Randall <khr@golang.org>

9495e45c

[dev.ssa] cmd/compile: treat control ops as live at end of block · 573c791e

Josh Bleecher Snyder authored Aug 04, 2015

Failure to treat control ops as live can lead
to them being eliminated when they live in
other blocks.

Change-Id: I604a1977a3d3884b1f4516bea4e15885ce38272d
Reviewed-on: https://go-review.googlesource.com/13138Reviewed-by: Keith Randall <khr@golang.org>

573c791e

[dev.ssa] cmd/compile: always print block control values · 54dca047

Josh Bleecher Snyder authored Aug 04, 2015

They were being omitted after scheduling.

Change-Id: Ia20e2dcb61fde9ec854918b958c3897bafd282a6
Reviewed-on: https://go-review.googlesource.com/13140Reviewed-by: Keith Randall <khr@golang.org>

54dca047

[dev.ssa] cmd/compile/internal/ssa: put new values for block rewrites in rewritten block · 683f5d7b

Keith Randall authored Aug 04, 2015

Don't put them in the control value's block.
That may be many blocks up the dominator tree.

Change-Id: Iab3ea36a890ffe0e355dadec7aeb676901c4f070
Reviewed-on: https://go-review.googlesource.com/13134Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

683f5d7b

[dev.ssa] cmd/compile: log progs during ssa codegen · b8efee0d

Josh Bleecher Snyder authored Jul 31, 2015

This is helpful when debugging generated code.

Change-Id: I268efa3593a03bb2c4e9f07d9034c004cd40df41
Reviewed-on: https://go-review.googlesource.com/13099Reviewed-by: Keith Randall <khr@golang.org>

b8efee0d

[dev.ssa] cmd/compile: simplify repeated OCOM · 38ed6c10

Todd Neal authored Jul 30, 2015

Rewrite ^{n}x to be ^{n % 2}x.  This will eventually resolve a fuzz
issue that breaks v1.5.

Updates #11352

Change-Id: I1b3f93872d06222f9ff5f6fd5580178ebaf4c003
Reviewed-on: https://go-review.googlesource.com/13110Reviewed-by: Keith Randall <khr@golang.org>

38ed6c10

[dev.ssa] cmd/compile/ssa : fix typo in error message · faee3928

Todd Neal authored Aug 04, 2015

Change-Id: Ibb5169aade15190773ff7dd11b303c1f1345a0c2
Reviewed-on: https://go-review.googlesource.com/13100Reviewed-by: Keith Randall <khr@golang.org>

faee3928

[dev.ssa] cmd/compile/internal/ssa: Fix scheduler · a678a5c7

Keith Randall authored Aug 03, 2015

The DFS scheduler doesn't do the right thing. If a Value x is used by
more than one other Value, then x is put into the DFS queue when
its first user (call it y) is visited. It is not removed and reinserted
when the second user of x (call it z) is visited, so the dependency
between x and z is not respected. There is no easy way to fix this with
the DFS queue because we'd have to rip values out of the middle of the
DFS queue.

The new scheduler works from the end of the block backwards, scheduling
instructions which have had all of their uses already scheduled.
A simple priority scheme breaks ties between multiple instructions that
are ready to schedule simultaneously.

Keep track of whether we've scheduled or not, and make print() use
the scheduled order if we have.

Fix some shift tests that this change tickles. Add unsigned right shift tests.

Change-Id: I44164c10bb92ae8ab8f76d7a5180cbafab826ea1
Reviewed-on: https://go-review.googlesource.com/13069Reviewed-by: Todd Neal <todd@tneal.org>

a678a5c7

03 Aug, 2015 3 commits

[dev.ssa] cmd/compile/ssa: speed up nilcheck · 4dcf8ea1

Todd Neal authored Jul 14, 2015

Reworks nilcheck to be performed by a depth first traversal of the
dominator tree, keeping an updated map of the values that have been
nil-checked during the traversal.

benchmark                           old ns/op     new ns/op     delta
BenchmarkNilCheckDeep1-8            1242          1825          +46.94%
BenchmarkNilCheckDeep10-8           2397          3942          +64.46%
BenchmarkNilCheckDeep100-8          29105         24873         -14.54%
BenchmarkNilCheckDeep1000-8         2742563       265760        -90.31%
BenchmarkNilCheckDeep10000-8        335690119     3157995       -99.06%

benchmark                           old MB/s     new MB/s     speedup
BenchmarkNilCheckDeep1-8            0.81         0.55         0.68x
BenchmarkNilCheckDeep10-8           4.17         2.54         0.61x
BenchmarkNilCheckDeep100-8          3.44         4.02         1.17x
BenchmarkNilCheckDeep1000-8         0.36         3.76         10.44x
BenchmarkNilCheckDeep10000-8        0.03         3.17         105.67x

benchmark                        old allocs     new allocs     delta
BenchmarkNilCheckDeep1-8         9              14             +55.56%
BenchmarkNilCheckDeep10-8        9              23             +155.56%
BenchmarkNilCheckDeep100-8       9              113            +1155.56%
BenchmarkNilCheckDeep1000-8      9              1015
+11177.78%
BenchmarkNilCheckDeep10000-8     9              10024
+111277.78%

benchmark                        old bytes     new bytes     delta
BenchmarkNilCheckDeep1-8         432           608           +40.74%
BenchmarkNilCheckDeep10-8        1008          1496          +48.41%
BenchmarkNilCheckDeep100-8       8064          11656         +44.54%
BenchmarkNilCheckDeep1000-8      73728         145240        +96.99%
BenchmarkNilCheckDeep10000-8     737280        2144411       +190.85%

Change-Id: I0f86010e9823aec04aac744fdb589b65ec8acefc
Reviewed-on: https://go-review.googlesource.com/12332Reviewed-by: David Chase <drchase@google.com>

4dcf8ea1

[dev.ssa] cmd/compile/ssa: test against known values · 4ac823ee

Todd Neal authored Aug 03, 2015

Modify tests to use a known value instead of comparing the backends
directly.

Change-Id: I32e804e12515885bd94c4f83644cbca03b018fea
Reviewed-on: https://go-review.googlesource.com/13042Reviewed-by: Keith Randall <khr@golang.org>

4ac823ee

[dev.ssa] cmd/compile/internal/ssa/gen: add more simplifications rules · 9b25da73

Alexandru Moșoi authored Jul 31, 2015

This is a follow up on https://go-review.googlesource.com/#/c/12420/
with some rules moved to AMD64 closer to the existing rules.

Change-Id: Id346bb0fc4459b3c49b826a59cc74308a590310e
Reviewed-on: https://go-review.googlesource.com/12906Reviewed-by: Keith Randall <khr@golang.org>

9b25da73

31 Jul, 2015 1 commit

[dev.ssa] cmd/compile: handle non-in-place NEG and NOT · 93c354b6

Josh Bleecher Snyder authored Jul 31, 2015

This fixes the crypto/subtle tests.

Change-Id: Ie6e721eec3481f67f13de1bfbd7988e227793148
Reviewed-on: https://go-review.googlesource.com/13000Reviewed-by: Keith Randall <khr@golang.org>

93c354b6

30 Jul, 2015 6 commits

[dev.ssa] cmd/compile: move most types outside SSA · 85e0329f

Josh Bleecher Snyder authored Jul 30, 2015

The only types that remain in the ssa package
are special compiler-only types.

Change-Id: If957abf128ec0778910d67666c297f97f183b7ee
Reviewed-on: https://go-review.googlesource.com/12933Reviewed-by: Keith Randall <khr@golang.org>

85e0329f

[dev.ssa] cmd/compile: provide stack trace for caught panics · 165c1c16

Josh Bleecher Snyder authored Jul 30, 2015

Change-Id: I9cbb6d53a8c2302222b13d2f33b081b704208b8a
Reviewed-on: https://go-review.googlesource.com/12932Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Todd Neal <todd@tneal.org>

165c1c16

[dev.ssa] cmd/compile/internal/ssa/gen: implement OXOR. · 6d9362a1

Alexandru Moșoi authored Jul 30, 2015

From compiling go there were 260 functions where XOR was needed.

Much of the required changes for implementing XOR were already
done in 12813.

Change-Id: I5a68aa028f5ed597bc1d62cedbef3620753dfe82
Reviewed-on: https://go-review.googlesource.com/12901Reviewed-by: Keith Randall <khr@golang.org>

6d9362a1

[dev.ssa] cmd/compile: use Copy instead of ConvNop · 95aff4db

Josh Bleecher Snyder authored Jul 28, 2015

The existing backend simply elides OCONVNOP.
There's no reason for us to do any differently.
Rather than insert ConvNops and then rewrite them
away, stop creating them in the first place.

Change-Id: I4bcbe2229fcebd189ae18df24f2c612feb6e215e
Reviewed-on: https://go-review.googlesource.com/12810Reviewed-by: Keith Randall <khr@golang.org>

95aff4db

[dev.ssa] cmd/compile: fix SUBQ generation error · 9271ecc8

Todd Neal authored Jul 30, 2015

Fix code generation error that resulted in a multi-argument NEGQ

doasm: notfound ft=13 tt=13 00134 NEGQ AX, AX 13 13

Change-Id: I8b712d21a5523eccbae1f33ccea417844c27073e
Reviewed-on: https://go-review.googlesource.com/12869Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

9271ecc8

[dev.ssa] Merge remote-tracking branch 'origin/master' into mergebranch · 359747da
Keith Randall authored Jul 30, 2015
```
Semi-regular merge from tip into ssa branch

Change-Id: Ida553b5c504058347c0bdcb1a987727bdcea456b
```
359747da