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46 Commits

Author SHA1 Message Date
Dan Gohman 8eb36ef497 Add a comment describing why transforming (shl x, 1) to (add x, x) is to be 
considered safe enough in this context.

llvm-svn: 133159
 2011-06-16 15:55:48 +00:00
Benjamin Kramer e30b70073a X86: smulo -> add is now done target-independently in DAGCombiner, remove the patterns. 
llvm-svn: 131801
 2011-05-21 18:32:01 +00:00
Stuart Hastings 91f1d24736 Re-commit 131641 with fixes; de-pseudoize MOVSX16rr8 and friends. 
rdar://problem/8614450

llvm-svn: 131746
 2011-05-20 19:04:40 +00:00
Stuart Hastings c72240bbd9 Reverting 131641 to investigate 'bot complaint. 
llvm-svn: 131654
 2011-05-19 17:54:42 +00:00
Stuart Hastings b476b0cc9f Revise MOVSX16rr8/MOVZX16rr8 (and rm variants) to no longer be 
pseudos.  rdar://problem/8614450

llvm-svn: 131641
 2011-05-19 16:59:50 +00:00
Eric Christopher a1d9e29552 Support XOR and AND optimization with no return value. 
Finishes off rdar://8470697

llvm-svn: 131458
 2011-05-17 08:10:18 +00:00
Eric Christopher 4a34e61e53 Optimize atomic lock or that doesn't use the result value. 
Next up: xor and and.

Part of rdar://8470697

llvm-svn: 131171
 2011-05-10 23:57:45 +00:00
Eric Christopher e33464663f Refactor lock versions of binary operators to be a little less 
cut and paste.

llvm-svn: 131139
 2011-05-10 18:36:16 +00:00
Benjamin Kramer d724a590e5 X86: Add a bunch of peeps for add and sub of SETB. 
"b + ((a < b) ? 1 : 0)" compiles into
	cmpl	%esi, %edi
	adcl	$0, %esi
instead of
	cmpl	%esi, %edi
	sbbl	%eax, %eax
	andl	$1, %eax
	addl	%esi, %eax

This saves a register, a false dependency on %eax
(Intel's CPUs still don't ignore it) and it's shorter.

llvm-svn: 131070
 2011-05-08 18:36:07 +00:00
Dan Gohman f0f8e14370 The labyrinthine X86 backend no longer appears to require 
these patterns.

llvm-svn: 125759
 2011-02-17 18:50:19 +00:00
NAKAMURA Takumi 0cfdac078e Target/X86: Tweak win64's tailcall. 
llvm-svn: 124272
 2011-01-26 02:04:09 +00:00
NAKAMURA Takumi 9d29eff198 Fix whitespace. 
llvm-svn: 124270
 2011-01-26 02:03:37 +00:00
Eric Christopher 542f8a5221 The stub routine that we're calling uses test and so clobbers 
the flags.

llvm-svn: 123712
 2011-01-18 01:37:20 +00:00
Chris Lattner 46b9efcad7 We lower setb to sbb with the hope that the and will go away, when it 
doesn't, match it back to setb.

On a 64-bit version of the testcase before we'd get:

	movq	%rdi, %rax
	addq	%rsi, %rax
	sbbb	%dl, %dl
	andb	$1, %dl
	ret

now we get:

	movq	%rdi, %rax
	addq	%rsi, %rax
	setb	%dl
	ret

llvm-svn: 122217
 2010-12-20 01:16:03 +00:00
Chris Lattner 9edf3f50bf improve the setcc -> setcc_carry optimization to happen more 
consistently by moving it out of lowering into dag combine.

Add some missing patterns for matching away extended versions of setcc_c.

llvm-svn: 122201
 2010-12-19 22:08:31 +00:00
Evan Cheng be69d8e2f3 Only rr forms of ADD*_DB are commutable. 
llvm-svn: 121908
 2010-12-15 22:57:36 +00:00
Eric Christopher c2dc95ae00 Add rsp to the uses for the same reason as 32-bit. 
llvm-svn: 121328
 2010-12-09 00:26:41 +00:00
Rafael Espindola c4774795ce Move lowering of TLS_addr32 and TLS_addr64 to X86MCInstLower. 
llvm-svn: 120263
 2010-11-28 21:16:39 +00:00
Rafael Espindola 5d882894d8 Lower TLS_addr32 and TLS_addr64. 
llvm-svn: 120225
 2010-11-27 20:43:02 +00:00
Chris Lattner 941c19b7ba reject instructions that contain a \n in their asmstring. Mark 
various X86 and ARM instructions that are bitten by this as isCodeGenOnly,
as they are.

llvm-svn: 117884
 2010-11-01 00:46:16 +00:00
Chris Lattner 9492c17baf two changes: make the asmmatcher generator ignore ARM pseudos properly, 
and make it a hard error for instructions to not have an asm string.
These instructions should be marked isCodeGenOnly.

llvm-svn: 117861
 2010-10-31 19:15:18 +00:00
Michael J. Spencer f509c6ca27 X86: Add alloca probing to dynamic alloca on Windows. Fixes PR8424. 
llvm-svn: 116984
 2010-10-21 01:41:01 +00:00
Michael J. Spencer 9cafc872ab Fix Whitespace. 
llvm-svn: 116972
 2010-10-20 23:40:27 +00:00
Rafael Espindola 2216af3fa8 Fix another case where we were preferring instructions with large 
immediates instead of 8 bits ones.

llvm-svn: 116410
 2010-10-13 17:14:25 +00:00
Rafael Espindola 8ea9b0eb32 Fix PR8365 by adding a more specialized Pat that checks if an 'and' with 
8 bit constants can be used.

llvm-svn: 116403
 2010-10-13 13:31:20 +00:00
Dan Gohman 395a898b2b Initial va_arg support for x86-64. Patch by David Meyer! 
llvm-svn: 116319
 2010-10-12 18:00:49 +00:00
Chris Lattner dd77477690 reapply: Use the new TB_NOT_REVERSABLE flag instead of special 
reapply: reimplement the second half of the or/add optimization.  We should now

with no changes.  Turns out that one missing "Defs = [EFLAGS]" can upset things
a bit.

llvm-svn: 116040
 2010-10-08 03:57:25 +00:00
Chris Lattner 626656a562 reapply the patch reverted in r116033: 
"Reimplement (part of) the or -> add optimization.  Matching 'or' into 'add'"

With a critical fix: the add pseudos clobber EFLAGS.

llvm-svn: 116039
 2010-10-08 03:54:52 +00:00
Daniel Dunbar 8f21f9c1fb Revert "Reimplement (part of) the or -> add optimization. Matching 'or' into 
'add'", which seems to have broken just about everything.

llvm-svn: 116033
 2010-10-08 02:07:32 +00:00
Daniel Dunbar efdf08b5b8 Revert "reimplement the second half of the or/add optimization. We should now", 
which depends on r116007, which I am about to revert.

llvm-svn: 116031
 2010-10-08 02:07:26 +00:00
Chris Lattner 134f415bf8 reimplement the second half of the or/add optimization. We should now 
only end up emitting LEA instead of OR.  If we aren't able to promote
something into an LEA, we should never be emitting it as an ADD.

Add some testcases that we emit "or" in cases where we used to produce
an "add".

llvm-svn: 116026
 2010-10-08 01:05:10 +00:00
Chris Lattner 4fb38d3cd3 Reimplement (part of) the or -> add optimization. Matching 'or' into 'add' 
is general goodness because it allows ORs to be converted to LEA to avoid
inserting copies.  However, this is bad because it makes the generated .s
file less obvious and gives valgrind heartburn (tons of false positives in
bitfield code).

While the general fix should be in valgrind, we can at least try to avoid
emitting ADD instructions that *don't* get promoted to LEA.  This is more
work because it requires introducing pseudo instructions to represents
"add that knows the bits are disjoint", but hey, people really love valgrind.

This fixes this testcase:
https://bugs.kde.org/show_bug.cgi?id=242137#c20

the add r/i cases are coming next.

llvm-svn: 116007
 2010-10-07 23:36:18 +00:00
Chris Lattner cff5b0ea36 Move cmov pseudo instructions to InstrCompiler, 
convert all the rest of the cmovs to the multiclass,
with good results:

 X86InstrCMovSetCC.td |  598 +--------------------------------------------------
 X86InstrCompiler.td  |   61 +++++
 2 files changed, 77 insertions(+), 582 deletions(-)

llvm-svn: 115707
 2010-10-05 23:09:10 +00:00
Chris Lattner 1a1c600110 Use #NAME# to have the CMOV multiclass define things with the same names as before 
(e.g. CMOVBE16rr instead of CMOVBErr16).

llvm-svn: 115705
 2010-10-05 23:00:14 +00:00
Chris Lattner 7538ed80a9 enhance tblgen to support anonymous defm's, use this to 
simplify the X86 CMOVmr's.

llvm-svn: 115702
 2010-10-05 22:51:56 +00:00
Chris Lattner fa25dd9548 convert cmov mr patterns to use a multipattern. Death to redundancy 
and verbosity

llvm-svn: 115701
 2010-10-05 22:42:54 +00:00
Chris Lattner 0067ee02f9 switch CMOVBE to the multipattern: 
21 insertions(+), 53 deletions(-)

Moar change coming before I switch the rest.

llvm-svn: 115697
 2010-10-05 22:23:58 +00:00
Chris Lattner 8f4f1d1136 move SETB pseudos into the same place in InstrCompiler.td 
llvm-svn: 115686
 2010-10-05 21:18:04 +00:00
Chris Lattner 84571a1581 move some instructions from Instr64Bit -> InstrInfo. 
bswap32 doesn't read eflags.

llvm-svn: 115604
 2010-10-05 06:47:35 +00:00
Chris Lattner da8c94ef44 move CMOV_FR32 and friends to InstrCompiler, since they are 
pseudo instructions.

Move POPCNT to InstrSSE since they are SSE4 instructions.

llvm-svn: 115603
 2010-10-05 06:41:40 +00:00
Chris Lattner 44a5a2b569 move various pattern matching support goop out of X86Instr64Bit, to live 
with the 32-bit stuff.

llvm-svn: 115602
 2010-10-05 06:37:31 +00:00
Chris Lattner fa9b058eef split conditional moves and setcc's out to their own file. 
llvm-svn: 115601
 2010-10-05 06:33:16 +00:00
Chris Lattner f9594ba4e7 move string pseudo instructions to InstrCompiler consolidate 64-bit and 32-bit together. 
llvm-svn: 115600
 2010-10-05 06:27:48 +00:00
Chris Lattner c184a57e98 move the atomic pseudo instructions out to X86InstrCompiler.td 
llvm-svn: 115599
 2010-10-05 06:22:35 +00:00
Chris Lattner c793f8bca6 move more pseudo instructions out to X86InstrCompiler.td 
llvm-svn: 115598
 2010-10-05 06:10:16 +00:00
Chris Lattner ae33f5d93b continue moving stuff out to X86InstrSystem.td. Move 
control flow stuff out to X86InstrControl.td.  Move
some compiler pseudo instructions and Pat<> patterns
out to X86InstrCompiler.td

llvm-svn: 115596
 2010-10-05 06:04:14 +00:00