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Author SHA1 Message Date
Chris Lattner 0101f45785 another xform that is target-independent (should be done in instcombine). 
llvm-svn: 73472
 2009-06-16 06:15:56 +00:00
Chris Lattner aba55a69b1 I think instcombine should unconditionally do this xform. 
llvm-svn: 73471
 2009-06-16 06:11:35 +00:00
Eli Friedman 32ad5e9c08 Misc x86 README updates: remove a couple of already-fixed issues, 
add a few suggestions from looking at some assembly code.

llvm-svn: 73210
 2009-06-11 23:07:04 +00:00
Chris Lattner 9b65031add add some late optimizations that GCC does. It thinks these are a win 
even on Core2, not just AMD processors which was a surprise to me.

llvm-svn: 72396
 2009-05-25 20:28:19 +00:00
Chris Lattner be31b7b534 we should eventually add -march=atom and the new atom movbe instruction. 
llvm-svn: 72387
 2009-05-25 16:34:44 +00:00
Chris Lattner 4147f08e44 Move 3 "(add (select cc, 0, c), x) -> (select cc, x, (add, x, c))" 
related transformations out of target-specific dag combine into the
ARM backend.  These were added by Evan in r37685 with no testcases
and only seems to help ARM (e.g. test/CodeGen/ARM/select_xform.ll).

Add some simple X86-specific (for now) DAG combines that turn things
like cond ? 8 : 0  -> (zext(cond) << 3).  This happens frequently
with the recently added cp constant select optimization, but is a
very general xform.  For example, we now compile the second example
in const-select.ll to:

_test:
        movsd   LCPI2_0, %xmm0
        ucomisd 8(%esp), %xmm0
        seta    %al
        movzbl  %al, %eax
        movl    4(%esp), %ecx
        movsbl  (%ecx,%eax,4), %eax
        ret

instead of:

_test:
        movl    4(%esp), %eax
        leal    4(%eax), %ecx
        movsd   LCPI2_0, %xmm0
        ucomisd 8(%esp), %xmm0
        cmovbe  %eax, %ecx
        movsbl  (%ecx), %eax
        ret

This passes multisource and dejagnu.

llvm-svn: 66779
 2009-03-12 06:52:53 +00:00
Dan Gohman b0d4009ec8 Add more information to the EFLAGS note. 
llvm-svn: 66515
 2009-03-10 00:26:23 +00:00
Dan Gohman d5b35ee215 Add a note about EFLAGS optimization. 
llvm-svn: 66508
 2009-03-09 23:47:02 +00:00
Chris Lattner 393ac62837 add a note. 
llvm-svn: 66360
 2009-03-08 03:04:26 +00:00
Chris Lattner cfd1f7aa9f add a note. 
llvm-svn: 66359
 2009-03-08 01:54:43 +00:00
Chris Lattner cba4b6f83d add a horrible note 
llvm-svn: 64719
 2009-02-17 01:16:14 +00:00
Dan Gohman f6ccacba36 MachineLICM now handles these cases. 
llvm-svn: 64620
 2009-02-15 23:24:52 +00:00
Chris Lattner 1aca40e349 add a note. 
llvm-svn: 64093
 2009-02-08 20:44:19 +00:00
Chris Lattner 527dd60430 add a note 
llvm-svn: 60632
 2008-12-06 22:49:05 +00:00
Eli Friedman e9ef170d4a A couple small cleanups, plus a new potential optimization. 
llvm-svn: 60286
 2008-11-30 07:52:27 +00:00
Evan Cheng 2d1937ede5 Add a README entry. 
llvm-svn: 59052
 2008-11-11 17:35:52 +00:00
Torok Edwin 33986d8f17 move the note to the correct README 
llvm-svn: 58104
 2008-10-24 19:23:07 +00:00
Dan Gohman b1d8d6ecff This is done. 
llvm-svn: 57733
 2008-10-17 21:38:40 +00:00
Evan Cheng 4884f87822 This is done. 
llvm-svn: 55348
 2008-08-26 01:13:44 +00:00
Nate Begeman 3851e29e20 Remove unnecessary readme entry 
llvm-svn: 53722
 2008-07-17 17:21:14 +00:00
Dan Gohman 02a2aaf2e7 Add a note about a potential PIC optimization. 
llvm-svn: 52663
 2008-06-24 00:53:07 +00:00
Chris Lattner 6e2bf7c67e add a micro optzn. 
llvm-svn: 50681
 2008-05-05 23:19:45 +00:00
Chris Lattner a89143f1e0 Add an ugly note. 
llvm-svn: 50029
 2008-04-21 04:46:30 +00:00
Evan Cheng 81e0c9a32c New entry. 
llvm-svn: 48912
 2008-03-28 07:07:06 +00:00
Evan Cheng 58db865d6e Remove duplicated entries. 
llvm-svn: 48714
 2008-03-23 22:56:07 +00:00
Christopher Lamb 8fe9109469 Fix X86's isTruncateFree to not claim that truncate to i1 is free. This fixes Bill's testcase that failed for r48491. 
llvm-svn: 48542
 2008-03-19 08:30:06 +00:00
Chris Lattner 477d0f5294 Add an issue that is preventing instcombine from doing a simplification. 
llvm-svn: 48356
 2008-03-14 06:00:19 +00:00
Chris Lattner a76e23a935 move these to the appropriate file 
llvm-svn: 48054
 2008-03-08 22:28:45 +00:00
Gabor Greif 636ab19205 some more spelling changes 
llvm-svn: 47996
 2008-03-06 10:51:21 +00:00
Chris Lattner a70df9e2ee Evan implemented these. 
llvm-svn: 47828
 2008-03-02 18:05:14 +00:00
Chris Lattner 83e80cd368 Add a random not very important note 
llvm-svn: 47704
 2008-02-28 04:52:59 +00:00
Eli Friedman 93e8b679a3 A few more small things I've run into. 
llvm-svn: 47702
 2008-02-28 00:21:43 +00:00
Evan Cheng 3d17e4c427 This is done. 
llvm-svn: 47688
 2008-02-27 20:26:32 +00:00
Eli Friedman 5d8fa828f1 A few minor updates, removing implemented stuff and adding a couple of 
new things.

llvm-svn: 47458
 2008-02-21 21:16:49 +00:00
Chris Lattner e86c91f5b2 Dan implemented one multiply issue. Replace it with another. :) 
llvm-svn: 47431
 2008-02-21 06:51:29 +00:00
Chris Lattner a827205670 Add a note about sext from i1 plus flags use. 
llvm-svn: 47278
 2008-02-18 18:30:13 +00:00
Chris Lattner 1f6520842c move PR2053 to here. 
llvm-svn: 47237
 2008-02-17 19:43:57 +00:00
Andrew Lenharth 9b254eed32 llvm.memory.barrier, and impl for x86 and alpha 
llvm-svn: 47204
 2008-02-16 01:24:58 +00:00
Chris Lattner eb63b09206 upgrade some entries, remove stuff that is done. 
llvm-svn: 47109
 2008-02-14 06:19:02 +00:00
Chris Lattner ff5998e66b add a note, remove a done deed. 
llvm-svn: 45869
 2008-01-11 18:00:13 +00:00
Arnold Schwaighofer 6cf72fbbaf Improve tail call optimized call's argument lowering. Before this 
commit all arguments where moved to the stack slot where they would
reside on a normal function call before the lowering to the tail call
stack slot. This was done to prevent arguments overwriting each other.
Now only arguments sourcing from a FORMAL_ARGUMENTS node or a
CopyFromReg node with virtual register (could also be a caller's
argument) are lowered indirectly.

 --This line, and those below, will be ignored--

M    X86/X86ISelLowering.cpp
M    X86/README.txt

llvm-svn: 45867
 2008-01-11 16:49:42 +00:00
Chris Lattner 9129f51f9b add a testcase 
llvm-svn: 45768
 2008-01-09 00:37:18 +00:00
Chris Lattner ef81aa75f6 add a note that is important for some fp apps. 
llvm-svn: 45723
 2008-01-07 21:59:58 +00:00
Chris Lattner 3b6a82118b Fold comparisons against a constant nan, and optimize ORD/UNORD 
comparisons with a constant.  This allows us to compile isnan to:

_foo:
	fcmpu cr7, f1, f1
	mfcr r2
	rlwinm r3, r2, 0, 31, 31
	blr 

instead of:

LCPI1_0:					;  float
	.space	4
_foo:
	lis r2, ha16(LCPI1_0)
	lfs f0, lo16(LCPI1_0)(r2)
	fcmpu cr7, f1, f0
	mfcr r2
	rlwinm r3, r2, 0, 31, 31
	blr 

llvm-svn: 45405
 2007-12-29 08:37:08 +00:00
Chris Lattner 33de0c6e92 this xform is implemented. 
llvm-svn: 45404
 2007-12-29 08:19:39 +00:00
Chris Lattner 8013bd339b avoid going through a stack slot to convert from fpstack to xmm reg 
if we are just going to store it back anyway.  This improves things 
like:
double foo();
void bar(double *P) { *P = foo(); }

llvm-svn: 45399
 2007-12-29 06:41:28 +00:00
Chris Lattner 62ba67c0f7 add a note 
llvm-svn: 45397
 2007-12-29 05:51:58 +00:00
Chris Lattner d798002401 add a note. 
llvm-svn: 45387
 2007-12-28 21:50:40 +00:00
Chris Lattner 6c234bf58f add a simple hack 
llvm-svn: 45343
 2007-12-24 19:27:46 +00:00
Chris Lattner 2583a66295 add an obvious load folding missed optzn. 
llvm-svn: 45161
 2007-12-18 16:48:14 +00:00