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149 Commits

Author SHA1 Message Date
Chris Lattner
2940c5c56d Implement PR1795, an instcombine hack for forming GEPs with integer pointer arithmetic. 
llvm-svn: 45745
 2008-01-08 07:23:51 +00:00
Duncan Sands
404eb05247 The transform that tries to turn calls to bitcast functions into 
direct calls bails out unless caller and callee have essentially
equivalent parameter attributes.  This is illogical - the callee's
attributes should be of no relevance here.  Rework the logic, which
incidentally fixes a crash when removed arguments have attributes.

llvm-svn: 45658
 2008-01-06 18:27:01 +00:00
Duncan Sands
55e5090fe8 When transforming a call to a bitcast function into 
a direct call with cast parameters and cast return
value (if any), instcombine was prepared to cast any
non-void return value into any other, whether castable
or not.  Add a new predicate for testing whether casting
is valid, and check it both for the return value and
(as a cleanup) for the parameters.

llvm-svn: 45657
 2008-01-06 10:12:28 +00:00
Chris Lattner
e666bc272d remove a couple more unsafe xforms in the face of overflow. 
llvm-svn: 45613
 2008-01-05 01:22:42 +00:00
Chris Lattner
e96658392d dead calls to llvm.stacksave can be deleted, even though they 
have potential side-effects.

llvm-svn: 45392
 2007-12-29 00:59:12 +00:00
Chris Lattner
bc03f70a07 upgrade this test 
llvm-svn: 45391
 2007-12-29 00:57:06 +00:00
Owen Anderson
3de3f9981e Add a testcase for my recent InstCombine fix, written by Nicholas. 
llvm-svn: 45386
 2007-12-28 21:08:43 +00:00
Chris Lattner
74b2ab59fd implement InstCombine/shift-trunc-shift.ll. This allows 
us to compile:
#include <math.h>
int t1(double d) { return signbit(d); }

into:

_t1:
	movd	%xmm0, %rax
	shrq	$63, %rax
	ret

instead of:

_t1:
	movd	%xmm0, %rax
	shrq	$32, %rax
	shrl	$31, %eax
	ret

on x86-64.

llvm-svn: 45311
 2007-12-22 09:07:47 +00:00
Christopher Lamb
7d82bc46b8 Implement review feedback, including additional transforms 
(icmp slt (sub A B) 1) -> (icmp sle A B)
icmp sgt (sub A B) -1) -> (icmp sge A B)

and add testcase.

llvm-svn: 45256
 2007-12-20 07:21:11 +00:00
Christopher Lamb
74dbad9216 Remove an orthogonal transformation of the selection condition from my most recent submission. 
llvm-svn: 45169
 2007-12-18 20:30:28 +00:00
Christopher Lamb
30291f4a30 Fix typos. 
llvm-svn: 45159
 2007-12-18 09:45:40 +00:00
Christopher Lamb
8b09a464b4 Fold certain additions through selects (and their compares) so as to eliminate subtractions. This code is often produced by the SMAX expansion in SCEV. 
This implements test/Transforms/InstCombine/2007-12-18-AddSelCmpSub.ll

llvm-svn: 45158
 2007-12-18 09:34:41 +00:00
Duncan Sands
8e4847ee95 Make instcombine promote inline asm calls to 'nounwind' 
calls.  Remove special casing of inline asm from the
inliner.  There is a potential problem: the verifier
rejects invokes of inline asm (not sure why).  If an
asm call is not marked "nounwind" in some .ll, and
instcombine is not run, but the inliner is run, then
an illegal module will be created.  This is bad but
I'm not sure what the best approach is.  I'm tempted
to remove the check in the verifier...

llvm-svn: 45073
 2007-12-16 15:51:49 +00:00
Wojciech Matyjewicz
309e5a723b 1. "Upgrage" comments. 
2. Using zero-extended value of Scale and unsigned division is safe provided
   that Scale doesn't have the sign bit set.
   Previously these 2 instructions:
        %p = bitcast [100 x {i8,i8,i8}]* %x to i8*
        %q = getelementptr i8* %p, i32 -4
   were combined into:
        %q = getelementptr [100 x { i8, i8, i8 }]* %x, i32 0,
               i32 1431655764, i32 0
   what was incorrect.

llvm-svn: 44936
 2007-12-12 15:21:32 +00:00
Chris Lattner
6a6b3fb62b Implement constant folding if vector<->vector bitcasts where the number 
of source/dest elements changes.  This implements
test/Transforms/InstCombine/bitcast-vector-fold.ll

llvm-svn: 44855
 2007-12-11 07:29:44 +00:00
Chris Lattner
d2265b45ae Fix PR1850 by removing an unsafe transformation from VMCore/ConstantFold.cpp. 
Reimplement the xform in Analysis/ConstantFolding.cpp where we can use
targetdata to validate that it is safe.  While I'm in there, fix some const
correctness issues and generalize the interface to the "operand folder".

llvm-svn: 44817
 2007-12-10 22:53:04 +00:00
Chris Lattner
c00e8adfe0 Implement PR1822 
llvm-svn: 44318
 2007-11-25 21:27:53 +00:00
Duncan Sands
185eeac0f8 Fix PR1816. If a bitcast of a function only exists because of a 
trivial difference in function attributes, allow calls to it to
be converted to direct calls.  Based on a patch by Török Edwin.
While there, move the various lists of mutually incompatible
parameters etc out of the verifier and into ParameterAttributes.h.

llvm-svn: 44315
 2007-11-25 14:10:56 +00:00
Chris Lattner
1985d96dc9 Fix PR1817. 
llvm-svn: 44284
 2007-11-22 23:47:13 +00:00
Chris Lattner
c53b18362a Fix PR1800 by correcting mistaken logic. 
llvm-svn: 44188
 2007-11-16 06:04:17 +00:00
Andrew Lenharth
19ca5c7021 Better check 
llvm-svn: 43897
 2007-11-08 18:45:15 +00:00
Andrew Lenharth
8cf11aa330 Fix PR1780 
llvm-svn: 43893
 2007-11-08 17:39:28 +00:00
Chris Lattner
d8515f8e80 Implement PR1777 by detecting dependent phis that 
all compute the same value.

llvm-svn: 43777
 2007-11-06 21:52:06 +00:00
Dan Gohman
4decbc5002 Fix an abort in instcombine when folding creates a vector rem instruction. 
llvm-svn: 43743
 2007-11-05 23:16:33 +00:00
Chris Lattner
6ab19ed78d Fix InstCombine/2007-10-31-StringCrash.ll by removing an obvious 
(in hindsight) infinite recursion.  Simplify the code.

llvm-svn: 43597
 2007-11-01 02:30:35 +00:00
Chris Lattner
74709473ed Fix InstCombine/2007-10-31-RangeCrash.ll 
llvm-svn: 43596
 2007-11-01 02:18:41 +00:00
Dan Gohman
9f39660c20 Add support for folding binary operators with vector zero operands. 
llvm-svn: 43510
 2007-10-30 19:00:49 +00:00
Chris Lattner
00860d7574 update testcase 
llvm-svn: 43452
 2007-10-29 17:06:35 +00:00
Chris Lattner
c541c3ee15 Model stacksave and stackrestore as both writing memory, since we 
don't model their dependences on allocas correctly.  This fixes
PR1745.

llvm-svn: 43442
 2007-10-29 05:47:52 +00:00
Chris Lattner
9a641510bd Fix PR1749 and InstCombine/2007-10-28-EmptyField.ll by handling 
zero-length fields better.

llvm-svn: 43427
 2007-10-29 02:40:02 +00:00
Chris Lattner
c62877e9da Implement a couple of foldings for ordered and unordered comparisons, 
implementing cases related to PR1738.

llvm-svn: 43289
 2007-10-24 05:38:08 +00:00
Devang Patel
c0ced49a14 This test now passes. 
llvm-svn: 43183
 2007-10-19 17:11:01 +00:00
Devang Patel
9497767458 XFAIL for now. 
llvm-svn: 43111
 2007-10-18 00:48:43 +00:00
Devang Patel
91ff13edcc Apply "Instead of loading small c string constant, use integer constant directly" transformation while processing load instruction. 
llvm-svn: 43070
 2007-10-17 07:24:40 +00:00
Chris Lattner
ad618f66e6 Fix a bug in my patch last night that broke InstCombine/2007-10-12-Crash.ll 
llvm-svn: 42920
 2007-10-12 18:05:47 +00:00
Chris Lattner
3e99eb25ee testcase for PR1728 
llvm-svn: 42890
 2007-10-12 05:29:53 +00:00
Devang Patel
899cc56612 Lower memcpy if it makes sense. 
llvm-svn: 42864
 2007-10-11 17:21:57 +00:00
Duncan Sands
416b9f0410 Testcase for PR1678. 
llvm-svn: 42171
 2007-09-20 18:56:24 +00:00
Dan Gohman
2ac2652779 Instcombine x-((x/y)*y) into a remainder operator. 
llvm-svn: 42035
 2007-09-17 17:31:57 +00:00
Duncan Sands
94580c7522 Test that a call to a trampoline is turned into a call to 
the underlying nested function.

llvm-svn: 41846
 2007-09-11 15:07:50 +00:00
Chris Lattner
52fe869374 Fix a buggy constant folding transformation when handling aliases. 
llvm-svn: 41818
 2007-09-10 23:42:42 +00:00
Chris Lattner
85a51e0060 Don't zap back to back volatile load/stores 
llvm-svn: 41759
 2007-09-07 05:33:03 +00:00
Nick Lewycky
b0b066eaaa When the two operands of an icmp are equal, there are five possible predicates 
that would make the icmp true. Fixes PR1637.

llvm-svn: 41740
 2007-09-06 01:10:22 +00:00
Dale Johannesen
6480cc6f8c Change all floating constants that are not exactly 
representable to use hex format.

llvm-svn: 41722
 2007-09-05 17:50:36 +00:00
Dan Gohman
f9dd170e36 Convert tests using "| wc -l | grep ..." to use the count script. 
llvm-svn: 41097
 2007-08-15 13:36:28 +00:00
Chris Lattner
1399f64e3b oops, forgot to commit this. 
llvm-svn: 41034
 2007-08-12 16:55:14 +00:00
Chris Lattner
99c8ee2977 Transform a load from an undef/zero global into an undef/global even if we 
have complex pointer manipulation going on.  This allows us to compile
stuff like this:

__m128i foo(__m128i x){
                static const unsigned int c_0[4] = { 0, 0, 0, 0 };
                __m128i v_Zero = _mm_loadu_si128((__m128i*)c_0);
                x  = _mm_unpacklo_epi8(x,  v_Zero);
                return x;
}

into:

_foo:
        xorps   %xmm1, %xmm1
        punpcklbw       %xmm1, %xmm0
        ret

llvm-svn: 41022
 2007-08-11 18:48:48 +00:00
Chris Lattner
a8e4b4bc7b when we see a unaligned load from an insufficiently aligned global or 
alloca, increase the alignment of the load, turning it into an aligned load.

This allows us to compile:

#include <xmmintrin.h>
__m128i foo(__m128i x){
 static const unsigned int c_0[4] = { 0, 0, 0, 0 };
	  __m128i v_Zero = _mm_loadu_si128((__m128i*)c_0);
  x  = _mm_unpacklo_epi8(x,  v_Zero);
  return x;
}

into:

_foo:
	punpcklbw	_c_0.5944, %xmm0
	ret
	.data
	.lcomm	_c_0.5944,16,4		# c_0.5944

instead of:

_foo:
	movdqu	_c_0.5944, %xmm1
	punpcklbw	%xmm1, %xmm0
	ret
	.data
	.lcomm	_c_0.5944,16,2		# c_0.5944

llvm-svn: 40971
 2007-08-09 19:05:49 +00:00
Nick Lewycky
8052019a20 It's safe to fold not of fcmp. 
llvm-svn: 40870
 2007-08-06 20:04:16 +00:00
Chandler Carruth
7132e00de7 This is the patch to provide clean intrinsic function overloading support in LLVM. It cleans up the intrinsic definitions and generally smooths the process for more complicated intrinsic writing. It will be used by the upcoming atomic intrinsics as well as vector and float intrinsics in the future. 
This also changes the syntax for llvm.bswap, llvm.part.set, llvm.part.select, and llvm.ct* intrinsics. They are automatically upgraded by both the LLVM ASM reader and the bitcode reader. The test cases have been updated, with special tests added to ensure the automatic upgrading is supported.

llvm-svn: 40807
 2007-08-04 01:51:18 +00:00