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1320 Commits

Author SHA1 Message Date
Owen Anderson
508955156a Thread LLVMContext through the constant folding APIs, which touches a lot of files. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74844 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-07-06 18:42:36 +00:00
Owen Anderson
d672ecb017 Convert the first batch of passes to use LLVMContext. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74748 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-07-03 00:17:18 +00:00
Dan Gohman
6cc18fedf8 Fix an instcombine abort on a scalar-to-vector bitcast. This fixes PR4487. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74646 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-07-01 21:38:46 +00:00
Dan Gohman
fd3daa74c2 Generalize the zext(trunc(t) & C) instcombine to work even with 
C is not a low-bits mask, and add a similar instcombine for
zext((trunc(t) & C) ^ C).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73705 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-18 16:30:21 +00:00
Dan Gohman
a392c788be Instcombine zext(trunc(x) & mask) to x&mask, even if the trunc has 
multiple users.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73656 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-17 23:17:05 +00:00
Eli Friedman
a999a511f7 PR3439: Correct a silly mistake in the SimplifyDemandedUseBits code for 
SRem.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73598 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-17 02:57:36 +00:00
Dan Gohman
c6ac322c1c Generalize a few more instcombines to be vector/scalar-independent. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73541 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-16 19:55:29 +00:00
Chris Lattner
6cc8a93c48 Generalize instcombine's isSafeToLoadUnconditionally() function 
to ignore readonly calls, and factor it out of instcombine so
that it can be used by other passes.  Patch by Frits van Bommel!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73506 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-16 17:23:12 +00:00
Dan Gohman
6de29f8d96 Support vector casts in more places, fixing a variety of assertion 
failures.

To support this, add some utility functions to Type to help support
vector/scalar-independent code. Change ConstantInt::get and
ConstantFP::get to support vector types, and add an overload to
ConstantInt::get that uses a static IntegerType type, for
convenience.

Introduce a new getConstant method for ScalarEvolution, to simplify
common use cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73431 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-15 22:12:54 +00:00
Dan Gohman
a119de86a0 Fix old-style type names in comments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73362 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-14 23:30:43 +00:00
Dan Gohman
e54aba5fa9 Don't do (x - (y - z)) --> (x + (z - y)) on floating-point types, because 
it may round differently. This fixes PR4374.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73243 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-12 19:23:25 +00:00
Chris Lattner
3590abfda0 Fix 4366: store to null in non-default addr space should not be 
turned into unreachable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73195 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-11 17:54:56 +00:00
Eli Friedman
b9a4cacc91 PR4340: Run SimplifyDemandedVectorElts on insertelement instructions; 
sometimes it can find simplifications that won't be found otherwise.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73006 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-06 20:08:03 +00:00
Dan Gohman
ae3a0be92e Split the Add, Sub, and Mul instruction opcodes into separate 
integer and floating-point opcodes, introducing
FAdd, FSub, and FMul.

For now, the AsmParser, BitcodeReader, and IRBuilder all preserve
backwards compatability, and the Core LLVM APIs preserve backwards
compatibility for IR producers. Most front-ends won't need to change
immediately.

This implements the first step of the plan outlined here:
http://nondot.org/sabre/LLVMNotes/IntegerOverflow.txt


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72897 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-04 22:49:04 +00:00
Dan Gohman
77b81fe487 Don't do the X * 0.0 -> 0.0 transformation in instcombine, because 
instcombine doesn't know when it's safe. To partially compensate
for this, introduce new code to do this transformation in
dagcombine, which can use UnsafeFPMath.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72872 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-04 17:12:12 +00:00
Evan Cheng
2ddb6f1440 Fix bug in FoldFCmp_IntToFP_Cst. If inttofp is a uintofp, use unsigned instead of signed integer constant. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72300 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-05-22 23:10:53 +00:00
Dan Gohman
9004c8afd4 Teach ValueTracking a new way to analyze PHI nodes, and and teach 
Instcombine to be more aggressive about using SimplifyDemandedBits
on shift nodes. This allows a shift to be simplified to zero in the
included test case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72204 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-05-21 02:28:33 +00:00
Chris Lattner
aab6ec49d2 calls in nothrow functions can be marked nothrow even if the callee 
is not known to be nothrow.  This allows readnone/readonly functions
to be deleted even if we don't know whether the callee can throw.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71676 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-05-13 17:39:14 +00:00
Duncan Sands
777d2306b3 Rename PaddedSize to AllocSize, in the hope that this 
will make it more obvious what it represents, and stop
it being confused with the StoreSize.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71349 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-05-09 07:06:46 +00:00
Nick Lewycky
48f95ad971 This transform requires valid TargetData info. Wrap it in 'if (TD)' in 
preparation for the day we use null TargetData when no target is specified.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71210 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-05-08 06:47:37 +00:00
Dan Gohman
31e4c77fae Perform constant folding on operands of instructions with non-void 
types, such as loads and calls.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71175 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-05-07 19:43:39 +00:00
Duncan Sands
7af1c78b98 Allow readonly functions to unwind exceptions. Teach 
the optimizers about this.  For example, a readonly
function with no uses cannot be removed unless it is
also marked nounwind.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71071 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-05-06 06:49:50 +00:00
Dan Gohman
2fe4d0aacb Return null instead of false, as appropriate. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70054 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-25 17:28:45 +00:00
Dan Gohman
1c8491ecc7 Add several more icmp simplifications. Transform signed comparisons 
into unsigned ones when the operands are known to have the same
sign bit value.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70053 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-25 17:12:48 +00:00
Sanjiv Gupta
7787d4a34b Allow i16 type indices to gep. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69946 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-24 02:37:54 +00:00
Sanjiv Gupta
428098de62 Before trying to introduce/eliminate cast/ext/trunc to make indices type as 
pointer type, make sure that the pointer size is a valid sequential index type.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69574 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-20 06:05:54 +00:00
Chris Lattner
ddfa57bd7b Instcombine should not promote whole computation trees to "strange" 
integer types, unless they are already strange.  This prevents it from
turning the code produced by SROA into crazy libcalls and stuff that 
the code generator can't handle.  In the attached example, the result
was an i96 multiply that caused the x86 backend to assert.

Note that if TargetData had an idea of what the legal types are for
a target that this could be used to stop instcombine from introducing
i64 muls, as Scott wanted.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68598 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-08 05:41:03 +00:00
Chris Lattner
62ce3b31a7 fix rdar://6762290, a crash compiling cxx filt with clang. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68500 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-07 05:03:34 +00:00
Evan Cheng
de62192843 Throttle back "fold select into operand" transformation. InstCombine should not generate selects of two constants unless they are selects of 0 and 1. 
e.g.
define i32 @t1(i32 %c, i32 %x) nounwind {
       %t1 = icmp eq i32 %c, 0
       %t2 = lshr i32 %x, 18
       %t3 = select i1 %t1, i32 %t2, i32 %x
       ret i32 %t3
}

was turned into

define i32 @t2(i32 %c, i32 %x) nounwind {
       %t1 = icmp eq i32 %c, 0
       %t2 = select i1 %t1, i32 18, i32 0
       %t3 = lshr i32 %x, %t2
       ret i32 %t3
}

For most targets, that means materializing two constants and then a select. e.g. On x86-64

movl    %esi, %eax
shrl    $18, %eax
testl   %edi, %edi
cmovne  %esi, %eax
ret

=>

xorl    %eax, %eax
testl   %edi, %edi
movl    $18, %ecx
cmovne  %eax, %ecx
movl    %esi, %eax
shrl    %cl, %eax
ret

Also, the optimizer and codegen can reason about shl / and / add, etc. by a constant. This optimization will hinder optimizations using ComputeMaskedBits.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68142 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-31 20:42:45 +00:00
Chris Lattner
e8e4921967 Fix PR3874 by restoring a condition I removed, but making it more 
precise than it used to be.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67662 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-25 00:28:58 +00:00
Chris Lattner
569a7f087a oops, I intended to remove this, not comment it out. Thanks Duncan! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67657 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-24 23:48:25 +00:00
Chris Lattner
a0e6969bbe canonicalize inttoptr and ptrtoint instructions which cast pointers 
to/from integer types that are not intptr_t to convert to intptr_t
then do an integer conversion to the dest type.  This exposes the
cast to the optimizer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67638 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-24 18:35:40 +00:00
Chris Lattner
4f9797d683 two changes: 
1. Make instcombine always canonicalize trunc x to i1 into an icmp(x&1).  This 
   exposes the AND to other instcombine xforms and is more of what the code
   generator expects.
2. Rewrite the remaining trunc pattern match to use 'match', which 
   simplifies it a lot.
   


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67635 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-24 18:15:30 +00:00
Duncan Sands
64da9409cb Factorize out a concept - no functionality change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67454 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-21 21:27:31 +00:00
Chris Lattner
344c7c5cc4 Fix instcombine to not introduce undefined shifts when merging two 
shifts together.  This fixes PR3851.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67411 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-20 22:41:15 +00:00
Duncan Sands
ab6b226978 Don't load values out of global constants with weak 
linkage: the value may be replaced with something
different at link time.  (Frontends that want to
allow values to be loaded out of weak constants can
give their constants weak_odr linkage).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67407 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-20 21:53:29 +00:00
Chris Lattner
b44b3666f9 Fix PR3826 - InstComb assert with vector shift, by not calling ComputeNumSignBits on a vector. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67211 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-18 16:32:19 +00:00
Chris Lattner
46d232d4bc Remove a condition which is always true. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67089 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-17 17:55:15 +00:00
Dale Johannesen
d1c135c6e6 One more place where debug info affects codegen. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66930 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-13 19:23:20 +00:00
Bill Wendling
0582ae99ba Oops...I committed too much. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66867 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-13 04:39:26 +00:00
Bill Wendling
c7a09ab311 Temporarily XFAIL this test. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66866 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-13 04:37:11 +00:00
Dale Johannesen
a891518c4d Skip interleaved debug info when fast-forwarding through 
allocations.  Apparently the assumption is there is an
instruction (terminator?) following the allocation so I
am allowing the same assumption.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66716 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-11 22:19:43 +00:00
Dale Johannesen
ff278b11bf Removing a dead debug intrinsic shouldn't trigger 
another instcombine pass if we weren't going to make
one without debug info.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66576 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-10 21:19:49 +00:00
Chris Lattner
dfe964ce8c change the MemIntrinsic get/setAlignment method to take an unsigned 
instead of a Constant*, which is what the clients of it really want.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66364 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-08 03:59:00 +00:00
Chris Lattner
3ce5e887ae Introduce a new MemTransferInst pseudo class, which is a common 
parent between MemCpyInst and MemMoveInst, simplify some code to
use it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66361 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-08 03:37:16 +00:00
Dale Johannesen
4084c4ee34 Fix another case where debug info was affecting 
codegen.  I convinced myself it was OK to skip all
pointer bitcasts here too.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66122 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-05 02:06:48 +00:00
Dale Johannesen
a0a6637b25 Fix another case where a dbg.declare meant something 
had 2 uses instead of 1.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66112 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-05 00:39:02 +00:00
Dale Johannesen
cdb16aa5ab Always skip ptr-to-ptr bitcasts when counting, 
per Chris' suggestion.  Slightly faster.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65999 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-04 01:53:05 +00:00
Dale Johannesen
0d6596b7bf Make my earlier patch to skip debug intrinsics 
when counting work; it was only off by 1.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65993 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-04 01:20:34 +00:00
Dale Johannesen
4ded40a44d Instruction counters must skip the bitcasts that 
feed into llvm.dbg.declare nodes, as well as
the debug directives themselves.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65976 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-03 22:36:47 +00:00