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1117 Commits

Author SHA1 Message Date
Chris Lattner
965c769b3c move ComputeMaskedBits, MaskedValueIsZero, and ComputeNumSignBits 
out of instcombine into a new file in libanalysis.  This also teaches
ComputeNumSignBits about the number of sign bits in a constantint.

llvm-svn: 51863
 2008-06-02 01:18:21 +00:00
Duncan Sands
0397cd2ec4 When simplifying a call to a bitcast function, tighten up 
the conditions for performing the transform when only the
function declaration is available: no longer allow turning
i32 into i64 for example.  Only allow changing between
pointer types, and between pointer types and integers of
the same size.  For return values ptr -> intptr was already
allowed; I added ptr -> ptr and intptr -> ptr while there.
As shown by a recent objc testcase, changing the way
parameters/return values are passed can be fatal when calling
code written in assembler that directly manipulates call
arguments and return values unless the transform has no
impact on the way they are passed at the codegen level.
While it is possible to imagine an ABI that treats integers
of pointer size differently to pointers, I don't think LLVM
supports any so the transform should now be safe while still
being useful.

llvm-svn: 51834
 2008-06-01 07:38:42 +00:00
Nick Lewycky
035fe6f716 Peer through sext/zext when looking for not(cmp). 
llvm-svn: 51819
 2008-05-31 19:01:33 +00:00
Nick Lewycky
26b8cd84b3 Add more i1 optimizations. add, sub, mul, s/udiv on i1 are now simplified away. 
llvm-svn: 51817
 2008-05-31 17:59:52 +00:00
Nick Lewycky
df9242a833 Adding i1 is always Xor. 
llvm-svn: 51816
 2008-05-31 17:10:28 +00:00
Dan Gohman
86ff8536f9 const-ify getOpcode. 
llvm-svn: 51698
 2008-05-29 19:53:46 +00:00
Chris Lattner
ecdefb5df7 Implement PR2370: memmove(x,x,size) -> noop. 
llvm-svn: 51636
 2008-05-28 05:30:41 +00:00
Nick Lewycky
f6ccd2580c "ret (constexpr)" can't be folded into a Constant. Add a method to 
Analysis/ConstantFolding to fold ConstantExpr's, then make instcombine use it
to try to use targetdata to fold constant expressions on void instructions.

Also extend the icmp(inttoptr, inttoptr) folding to handle the case where
int size != ptr size.

llvm-svn: 51559
 2008-05-25 20:56:15 +00:00
Chris Lattner
87a099a057 Fix a serious brain-o. Obviously no-one reviewed my patch :( 
This fixes PR2359

llvm-svn: 51536
 2008-05-24 04:06:28 +00:00
Dan Gohman
f96e1371e8 Tidy up BasicBlock::getFirstNonPHI, and change a bunch of places to 
use it instead of duplicating its functionality.

llvm-svn: 51499
 2008-05-23 21:05:58 +00:00
Matthijs Kooijman
f52b23c0eb Replace some weird usage of UserOp1 introduced in r49492 by a plain if. 
llvm-svn: 51482
 2008-05-23 16:17:48 +00:00
Nick Lewycky
3bf5512d87 Constant integer vectors may also be negated. 
llvm-svn: 51476
 2008-05-23 04:54:45 +00:00
Nick Lewycky
8f3127c5b5 Typo. 
llvm-svn: 51475
 2008-05-23 04:39:38 +00:00
Nick Lewycky
4f3d878507 Revert X + X --> X * 2 optz'n which pessimizes heavily on x86. 
llvm-svn: 51474
 2008-05-23 04:34:58 +00:00
Nick Lewycky
452fb32927 Implement X + X for vectors. 
llvm-svn: 51472
 2008-05-23 04:14:51 +00:00
Nick Lewycky
2ec9a01173 Fix a recently added optimization to not crash on vectors. 
llvm-svn: 51471
 2008-05-23 03:26:47 +00:00
Dan Gohman
6d5f120c5c Generalize the new code in instcombine's ComputeNumSignBits for handling 
and/or to handle more cases (such as this add-sitofp.ll testcase), and
port it to selectiondag's ComputeNumSignBits.

llvm-svn: 51469
 2008-05-23 02:28:01 +00:00
Dan Gohman
53b2698531 Use isSingleValueType instead of isFirstClassType to 
exclude struct and array types.

llvm-svn: 51467
 2008-05-23 01:52:21 +00:00
Dan Gohman
81ab753b14 Port SelectionDAG's ComputeNumSignBits-using code to instcombine, 
now that instcombine also has ComputeNumSignBits.

llvm-svn: 51350
 2008-05-20 21:01:12 +00:00
Chris Lattner
7ac943fffd Teach instcombine 4 new xforms: 
(add (sext x), cst) --> (sext (add x, cst'))
  (add (sext x), (sext y)) --> (sext (add int x, y))
  (add double (sitofp x), fpcst) --> (sitofp (add int x, intcst))
  (add double (sitofp x), (sitofp y)) --> (sitofp (add int x, y))

This generally reduces conversions.  For example MiBench/telecomm-gsm
gets these simplifications:

HACK2: 	%tmp67.i142.i.i = sext i16 %tmp6.i141.i.i to i32		; <i32> [#uses=1]
	%tmp23.i139.i.i = sext i16 %tmp2.i138.i.i to i32		; <i32> [#uses=1]
	%tmp8.i143.i.i = add i32 %tmp67.i142.i.i, %tmp23.i139.i.i		; <i32> [#uses=3]
HACK2: 	%tmp67.i121.i.i = sext i16 %tmp6.i120.i.i to i32		; <i32> [#uses=1]
	%tmp23.i118.i.i = sext i16 %tmp2.i117.i.i to i32		; <i32> [#uses=1]
	%tmp8.i122.i.i = add i32 %tmp67.i121.i.i, %tmp23.i118.i.i		; <i32> [#uses=3]
HACK2: 	%tmp67.i.i190.i = sext i16 %tmp6.i.i189.i to i32		; <i32> [#uses=1]
	%tmp23.i.i187.i = sext i16 %tmp2.i.i186.i to i32		; <i32> [#uses=1]
	%tmp8.i.i191.i = add i32 %tmp67.i.i190.i, %tmp23.i.i187.i		; <i32> [#uses=3]
HACK2: 	%tmp67.i173.i.i.i = sext i16 %tmp6.i172.i.i.i to i32		; <i32> [#uses=1]
	%tmp23.i170.i.i.i = sext i16 %tmp2.i169.i.i.i to i32		; <i32> [#uses=1]
	%tmp8.i174.i.i.i = add i32 %tmp67.i173.i.i.i, %tmp23.i170.i.i.i		; <i32> [#uses=3]
HACK2: 	%tmp67.i152.i.i.i = sext i16 %tmp6.i151.i.i.i to i32		; <i32> [#uses=1]
	%tmp23.i149.i.i.i = sext i16 %tmp2.i148.i.i.i to i32		; <i32> [#uses=1]
	%tmp8.i153.i.i.i = add i32 %tmp67.i152.i.i.i, %tmp23.i149.i.i.i		; <i32> [#uses=3]
HACK2: 	%tmp67.i.i.i.i = sext i16 %tmp6.i.i.i.i to i32		; <i32> [#uses=1]
	%tmp23.i.i5.i.i = sext i16 %tmp2.i.i.i.i to i32		; <i32> [#uses=1]
	%tmp8.i.i7.i.i = add i32 %tmp67.i.i.i.i, %tmp23.i.i5.i.i		; <i32> [#uses=3]


This also fixes a bug in ComputeNumSignBits handling select and
makes it more aggressive with and/or.

llvm-svn: 51302
 2008-05-20 05:46:13 +00:00
Chris Lattner
9c27f96d04 fix two issues Neil noticed, thanks! 
llvm-svn: 51296
 2008-05-20 03:50:52 +00:00
Dan Gohman
d717761a2b Make AssociativeOpt static. 
llvm-svn: 51290
 2008-05-20 01:14:05 +00:00
Dan Gohman
123438cc05 Add a ComputeNumSignBits function for use by instcombine, based on the 
code in SelectionDAG.

llvm-svn: 51279
 2008-05-19 22:14:15 +00:00
Chris Lattner
b42712288e switch to Type::getFPMantissaWidth instead of reinventing it. 
llvm-svn: 51275
 2008-05-19 21:17:23 +00:00
Chris Lattner
ba9acbe6dc minor cleanups, teach instcombine that sitofp/uitofp cannot 
produce a negative zero.

llvm-svn: 51272
 2008-05-19 20:27:56 +00:00
Chris Lattner
e35fe0f1c6 convert fptosi(sitofp x) -> x if the fp value has enough bits in its mantissa 
to accurately represent the integer.  This triggers 9 times in 471.omnetpp,
though 8 of those seem to be inlined from the same place.

llvm-svn: 51271
 2008-05-19 20:25:04 +00:00
Chris Lattner
5920a78034 Fold FP comparisons where one operand is converted from an integer 
type and the other operand is a constant into integer comparisons.
This happens surprisingly frequently (e.g. 10 times in 471.omnetpp),
which are things like this:

	%tmp8283 = sitofp i32 %tmp82 to double	
	%tmp1013 = fcmp ult double %tmp8283, 0.0

Clearly comparing tmp82 against i32 0 is cheaper here.

this also triggers 8 times in gobmk, including this one:

	%tmp375376 = sitofp i32 %tmp375 to double
	%tmp377 = fcmp ogt double %tmp375376, 8.150000e+01

which is comparing an integer against 81.5 :).

llvm-svn: 51268
 2008-05-19 20:18:56 +00:00
Chris Lattner
6e70830af9 remove debug output 
llvm-svn: 51264
 2008-05-19 20:03:53 +00:00
Chris Lattner
fc365b60dc be more aggressive about transforming add -> or when the operands have no 
intersecting bits.  This triggers all over the place, for example in lencode,
with adds of stuff like:

	%tmp580 = mul i32 %tmp579, 2	
	%tmp582 = and i32 %b8, 1
and

	%tmp28 = shl i32 %abs.i, 1		
	%sign.0 = select i1 %tmp23, i32 1, i32 0
and
	%tmp344 = shl i32 %tmp343, 2	
	%tmp346 = and i32 %tmp96, 3

etc.

llvm-svn: 51263
 2008-05-19 20:01:56 +00:00
Chris Lattner
4b2a724fb8 Fix PR2339 
llvm-svn: 51226
 2008-05-18 04:11:26 +00:00
Nick Lewycky
79376f4e02 Move isTrueWhenEqual to ICmpInst. 
llvm-svn: 51215
 2008-05-17 07:33:39 +00:00
Gabor Greif
e1f6e4b21d API change for {BinaryOperator|CmpInst|CastInst}::create*() --> Create. Legacy interfaces will be in place for some time. (Merge from use-diet branch.) 
llvm-svn: 51200
 2008-05-16 19:29:10 +00:00
Chris Lattner
5c953b7d27 implement PR2328. 
llvm-svn: 51176
 2008-05-16 02:59:42 +00:00
Gabor Greif
697e94cc22 Fix a bunch of 80col violations that arose from the Create API change. Tweak makefile targets to find these better. 
llvm-svn: 51143
 2008-05-15 10:04:30 +00:00
Bill Wendling
3716952f10 Situations can arise when you have a function called that returns a 'void', but 
is bitcast to return a floating point value. The result of the instruction may
not be used by the program afterwards, and LLVM will happily remove all
instructions except the call. But, on some platforms, if a value is returned as
a floating point, it may need to be removed from the stack (like x87). Thus, we
can't get rid of the bitcast even if there isn't a use of the value.

llvm-svn: 51134
 2008-05-14 22:45:20 +00:00
Dan Gohman
d78c400b5b Clean up the use of static and anonymous namespaces. This turned up 
several things that were neither in an anonymous namespace nor static
but not intended to be global.

llvm-svn: 51017
 2008-05-13 00:00:25 +00:00
Chris Lattner
a4ee1f516f don't sink invokes, even if they are readonly. This fixes a 
crash on kimwitu++.

llvm-svn: 50901
 2008-05-09 15:07:33 +00:00
Chris Lattner
aaba10e843 Implement PR2298. This transforms: 
~x < ~y --> y < x
   -x == -y --> x == y

llvm-svn: 50882
 2008-05-09 05:19:28 +00:00
Chris Lattner
49a594e6ab More than just loads can read from memory: readonly calls like strlen 
also need to be checked for memory modifying instructions before we
can sink them.  THis fixes the second half of PR2297.

llvm-svn: 50860
 2008-05-08 17:37:37 +00:00
Chris Lattner
4fa09669d8 Make instcombine's DSE respect loads as well as stores. It is not safe to 
delete the first store in:

store x -> p
load p
store y -> p

This is for PR2297.

llvm-svn: 50859
 2008-05-08 17:20:30 +00:00
Anton Korobeynikov
fc2edad4ae Turn StripPointerCast() into a method 
llvm-svn: 50836
 2008-05-07 22:54:15 +00:00
Dan Gohman
5a3eecdfd8 Fix a bug in the ComputeMaskedBits logic for multiply. 
llvm-svn: 50793
 2008-05-07 00:35:55 +00:00
Anton Korobeynikov
82c02b28f3 Make StripPointerCast a common function (should we mak it method of Value instead?) 
llvm-svn: 50775
 2008-05-06 22:52:30 +00:00
Devang Patel
7ffc3c9a95 Fix typo. 
llvm-svn: 50713
 2008-05-06 05:40:11 +00:00
Dan Gohman
cf0e3acf16 Correct the value of LowBits in srem and urem handling in 
ComputeMaskedBits.

llvm-svn: 50692
 2008-05-06 00:51:48 +00:00
Devang Patel
a1ec89fbf1 Do not sink getresult. 
llvm-svn: 50600
 2008-05-03 00:36:30 +00:00
Dan Gohman
1962c2be6a Fix a mistake in the computation of leading zeros for udiv. 
llvm-svn: 50591
 2008-05-02 21:30:02 +00:00
Dan Gohman
4be6ae4e6c Fix an overaggressive SimplifyDemandedBits optimization on urem. This 
fixes the 254.gap regression on x86 and the 403.gcc regression on x86-64.

llvm-svn: 50537
 2008-05-01 19:13:24 +00:00
Chris Lattner
2dc4426675 move lowering of llvm.memset -> store from simplify libcalls 
to instcombine.

llvm-svn: 50472
 2008-04-30 06:39:11 +00:00
Chris Lattner
d9e3b5c5bd don't eliminate load from volatile value on paths where the load is dead. 
This fixes the second half of PR2262

llvm-svn: 50430
 2008-04-29 17:28:22 +00:00