e2395dc27b
Fix isEliminableCastPair to work correctly in the presence of pointers
...
with different sizes.
llvm-svn: 167018
2012-10-30 16:03:32 +00:00
12d9127833
Add in support for getIntPtrType to get the pointer type based on the address space.
...
This checkin also adds in some tests that utilize these paths and updates some of the
clients.
llvm-svn: 166578
2012-10-24 15:52:52 +00:00
4bb926d91d
Resubmit the changes to llvm core to update the functions to support different pointer sizes on a per address space basis.
...
llvm-svn: 165941
2012-10-15 16:24:29 +00:00
0c61134d8d
Revert 165732 for further review.
...
llvm-svn: 165747
2012-10-11 21:27:41 +00:00
083189730e
Add in the first iteration of support for llvm/clang/lldb to allow variable per address space pointer sizes to be optimized correctly.
...
llvm-svn: 165726
2012-10-11 17:21:41 +00:00
cdfe20b97f
Move TargetData to DataLayout.
...
llvm-svn: 165402
2012-10-08 16:38:25 +00:00
91ce36c986
Revert 'Fix a typo 'iff' => 'if''. iff is an abreviation of if and only if. See: http://en.wikipedia.org/wiki/If_and_only_if Commit 164767
...
llvm-svn: 164768
2012-09-27 10:14:43 +00:00
721cffd53a
Fix a typo 'iff' => 'if'
...
llvm-svn: 164767
2012-09-27 09:59:43 +00:00
c5c4e96f3e
Revert remaining part of r93200: "Disable folding sext(trunc(x)) -> x"
...
This fixes PR5997.
These transforms were disabled because codegen couldn't deal with other
uses of trunc(x). This is now handled by the peephole pass.
This causes no regressions on x86-64.
llvm-svn: 159003
2012-06-22 16:36:43 +00:00
3fa32f2452
replace usage of EmitGEPOffset() with TargetData::getIndexedOffset() when the GEP offset is known to be constant.
...
With this change, we avoid relying on the IR Builder to constant fold the operations.
No functionality change intended.
llvm-svn: 158829
2012-06-20 17:30:51 +00:00
cb2a1a34e2
Small fix in InstCombineCasts.cpp. Restored "alloca + bitcast" reducing for case when alloca's size is calculated within the "add/sub/... nsw".
...
Also added fix to 2011-06-13-nsw-alloca.ll test.
llvm-svn: 156231
2012-05-05 07:09:40 +00:00
ba0a6cabb8
Always compute all the bits in ComputeMaskedBits.
...
This allows us to keep passing reduced masks to SimplifyDemandedBits, but
know about all the bits if SimplifyDemandedBits fails. This allows instcombine
to simplify cases like the one in the included testcase.
llvm-svn: 154011
2012-04-04 12:51:34 +00:00
8213c8af29
Remove some dead code and tidy things up now that vectors use ConstantDataVector
...
instead of always using ConstantVector.
llvm-svn: 149912
2012-02-06 21:56:39 +00:00
46a9f016c5
More dead code removal (using -Wunreachable-code)
...
llvm-svn: 148578
2012-01-20 21:51:11 +00:00
518cda42b9
The powers that be have decided that LLVM IR should now support 16-bit
...
"half precision" floating-point with a first-class type.
This patch adds basic IR support (but not codegen support).
llvm-svn: 146786
2011-12-17 00:04:22 +00:00
e6de63dfc5
Last bit of TargetLibraryInfo propagation. Also fixed a case for TargetData
...
where it appeared beneficial to pass.
More of rdar://10500969
llvm-svn: 145630
2011-12-01 21:29:16 +00:00
385d9f6c24
Whitespace.
...
llvm-svn: 145470
2011-11-30 01:59:59 +00:00
82e1bd8e94
Add support for sqrt, sqrtl, and sqrtf in TargetLibraryInfo. Disable
...
(fptrunc (sqrt (fpext x))) -> (sqrtf x) transformation if -fno-builtin is
specified.
rdar://10466410
llvm-svn: 145460
2011-11-29 23:57:10 +00:00
547b6c5ecd
Stop emitting instructions with the name "tmp" they eat up memory and have to be uniqued, without any benefit.
...
If someone prefers %tmp42 to %42, run instnamer.
llvm-svn: 140634
2011-09-27 20:39:19 +00:00
5fc81ffbac
Fixes following the CR by Chris and Duncan:
...
Optimize chained bitcasts of the form A->B->A.
Undo r138722 and change isEliminableCastPair to allow this case.
llvm-svn: 138756
2011-08-29 19:58:36 +00:00
52600ee8c3
Bitcasts are transitive. Bitcast-Bitcast-X becomes Bitcast-X.
...
llvm-svn: 138722
2011-08-28 11:51:08 +00:00
d1b7849d49
Convert GetElementPtrInst to use ArrayRef.
...
llvm-svn: 135904
2011-07-25 09:48:08 +00:00
040dd82f44
Convert IRBuilder::CreateGEP and IRBuilder::CreateInBoundsGEP to use
...
ArrayRef.
llvm-svn: 135761
2011-07-22 08:16:57 +00:00
911e12f505
Clean up includes of llvm/Analysis/ConstantFolding.h so it's included where it's used and not included where it isn't.
...
llvm-svn: 135628
2011-07-20 21:57:23 +00:00
229907cd11
land David Blaikie's patch to de-constify Type, with a few tweaks.
...
llvm-svn: 135375
2011-07-18 04:54:35 +00:00
b94674b325
It's not safe to fold (fptrunc (sqrt (fpext x))) to (sqrtf x) if there is another use of sqrt. rdar://9763193
...
llvm-svn: 135058
2011-07-13 19:08:16 +00:00
3c68b626e7
Reapply a fixed version of r133285.
...
This tightens up checking for overflow in alloca sizes, based on feedback
from Duncan and John about the change in r132926.
llvm-svn: 134749
2011-07-08 22:09:33 +00:00
c76b9d8c2f
Revert r133285. Causing odd failures on Dragonegg.
...
llvm-svn: 133301
2011-06-17 22:08:25 +00:00
23be986a0c
Relocate NUW test to cover all binary ops in a dynamic alloca expr.
...
Followup to 132926. rdar://problem/9265821
llvm-svn: 133285
2011-06-17 20:21:52 +00:00
351a3f881f
Avoid fusing bitcasts with dynamic allocas if the amount-to-allocate
...
might overflow. Re-typing the alloca to a larger type (e.g. double)
hoists a shift into the alloca, potentially exposing overflow in the
expression. rdar://problem/9265821
llvm-svn: 132926
2011-06-13 18:48:49 +00:00
35211c6091
Final step of instcombine debuginfo; switch a couple more places over to InsertNewInstWith, and use setDebugLoc for the cases which can't be easily handled by the automated mechanisms.
...
llvm-svn: 132167
2011-05-27 00:19:40 +00:00
1754a25977
More instcombine simplifications towards better debug locations.
...
llvm-svn: 131596
2011-05-18 23:11:30 +00:00
b9ed18f2cb
Use ReplaceInstUsesWith instead of replaceAllUsesWith where appropriate in instcombine.
...
llvm-svn: 131512
2011-05-18 00:32:01 +00:00
50a281a871
While SimplifyDemandedBits constant folds this, we can't rely on it here.
...
It's possible to craft an input that hits the recursion limits in a way
that SimplifyDemandedBits doesn't simplify the icmp but ComputeMaskedBits
can infer which bits are zero.
No test case as it depends on too many other things. Fixes PR9609.
llvm-svn: 128777
2011-04-02 18:50:58 +00:00
8b94c295c3
Fix comment.
...
llvm-svn: 128745
2011-04-01 22:29:18 +00:00
5cad45307e
Tweaks to the icmp+sext-to-shifts optimization to address Frits' comments:
...
- Localize the check if an icmp has one use to a place where we know we're
introducing something that's likely more expensive than a sext from i1.
- Add an assert to make sure a case that would lead to a miscompilation is
folded away earlier.
- Fix a typo.
llvm-svn: 128744
2011-04-01 22:22:11 +00:00
ac2d5657a6
Fix build.
...
llvm-svn: 128733
2011-04-01 20:15:16 +00:00
d121765e64
InstCombine: Turn icmp + sext into bitwise/integer ops when the input has only one unknown bit.
...
int test1(unsigned x) { return (x&8) ? 0 : -1; }
int test3(unsigned x) { return (x&8) ? -1 : 0; }
before (x86_64):
_test1:
andl $8, %edi
cmpl $1, %edi
sbbl %eax, %eax
ret
_test3:
andl $8, %edi
cmpl $1, %edi
sbbl %eax, %eax
notl %eax
ret
after:
_test1:
shrl $3, %edi
andl $1, %edi
leal -1(%rdi), %eax
ret
_test3:
shll $28, %edi
movl %edi, %eax
sarl $31, %eax
ret
llvm-svn: 128732
2011-04-01 20:09:10 +00:00
398b8c5faf
InstCombine: Move (sext icmp) transforms into their own method. No intended functionality change.
...
llvm-svn: 128731
2011-04-01 20:09:03 +00:00
52131344a2
Remove PHINode::reserveOperandSpace(). Instead, add a parameter to
...
PHINode::Create() giving the (known or expected) number of operands.
llvm-svn: 128537
2011-03-30 11:28:46 +00:00
e0938d8a87
(Almost) always call reserveOperandSpace() on newly created PHINodes.
...
llvm-svn: 128535
2011-03-30 11:19:20 +00:00
fbb482b314
llvm.dbg.declare intrinsic does not use any llvm::Values. It's magic!
...
llvm-svn: 127282
2011-03-08 22:12:11 +00:00
69229316aa
convert ConstantVector::get to use ArrayRef.
...
llvm-svn: 125537
2011-02-15 00:14:00 +00:00
34442e6ebf
revert my ConstantVector patch, it seems to have made the llvm-gcc
...
builders unhappy.
llvm-svn: 125504
2011-02-14 18:15:46 +00:00
d9f5b88548
Switch ConstantVector::get to use ArrayRef instead of a pointer+size
...
idiom. Change various clients to simplify their code.
llvm-svn: 125487
2011-02-14 07:55:32 +00:00
9c10d587f6
implement an instcombine xform that canonicalizes casts outside of and-with-constant operations.
...
This fixes rdar://8808586 which observed that we used to compile:
union xy {
struct x { _Bool b[15]; } x;
__attribute__((packed))
struct y {
__attribute__((packed)) unsigned long b0to7;
__attribute__((packed)) unsigned int b8to11;
__attribute__((packed)) unsigned short b12to13;
__attribute__((packed)) unsigned char b14;
} y;
};
struct x
foo(union xy *xy)
{
return xy->x;
}
into:
_foo: ## @foo
movq (%rdi), %rax
movabsq $1095216660480, %rcx ## imm = 0xFF00000000
andq %rax, %rcx
movabsq $-72057594037927936, %rdx ## imm = 0xFF00000000000000
andq %rax, %rdx
movzbl %al, %esi
orq %rdx, %rsi
movq %rax, %rdx
andq $65280, %rdx ## imm = 0xFF00
orq %rsi, %rdx
movq %rax, %rsi
andq $16711680, %rsi ## imm = 0xFF0000
orq %rdx, %rsi
movl %eax, %edx
andl $-16777216, %edx ## imm = 0xFFFFFFFFFF000000
orq %rsi, %rdx
orq %rcx, %rdx
movabsq $280375465082880, %rcx ## imm = 0xFF0000000000
movq %rax, %rsi
andq %rcx, %rsi
orq %rdx, %rsi
movabsq $71776119061217280, %r8 ## imm = 0xFF000000000000
andq %r8, %rax
orq %rsi, %rax
movzwl 12(%rdi), %edx
movzbl 14(%rdi), %esi
shlq $16, %rsi
orl %edx, %esi
movq %rsi, %r9
shlq $32, %r9
movl 8(%rdi), %edx
orq %r9, %rdx
andq %rdx, %rcx
movzbl %sil, %esi
shlq $32, %rsi
orq %rcx, %rsi
movl %edx, %ecx
andl $-16777216, %ecx ## imm = 0xFFFFFFFFFF000000
orq %rsi, %rcx
movq %rdx, %rsi
andq $16711680, %rsi ## imm = 0xFF0000
orq %rcx, %rsi
movq %rdx, %rcx
andq $65280, %rcx ## imm = 0xFF00
orq %rsi, %rcx
movzbl %dl, %esi
orq %rcx, %rsi
andq %r8, %rdx
orq %rsi, %rdx
ret
We now compile this into:
_foo: ## @foo
## BB#0: ## %entry
movzwl 12(%rdi), %eax
movzbl 14(%rdi), %ecx
shlq $16, %rcx
orl %eax, %ecx
shlq $32, %rcx
movl 8(%rdi), %edx
orq %rcx, %rdx
movq (%rdi), %rax
ret
A small improvement :-)
llvm-svn: 123520
2011-01-15 06:32:33 +00:00
5e3605552e
Whitespace fixes. No functionality change.
...
llvm-svn: 122110
2010-12-17 23:27:41 +00:00
7aa18bf46a
Add vector versions of some existing scalar transforms to aid codegen in matching psign & pblend operations to the IR produced by clang/gcc for their C idioms.
...
llvm-svn: 122105
2010-12-17 23:12:19 +00:00
6e27b3e004
Fix a serious performance regression introduced by r108687 on linux:
...
turning (fptrunc (sqrt (fpext x))) -> (sqrtf x) is great, but we have
to delete the original sqrt as well. Not doing so causes us to do
two sqrt's when building with -fmath-errno (the default on linux).
llvm-svn: 113260
2010-09-07 20:01:38 +00:00
50df36ac0a
for completeness, allow undef also.
...
llvm-svn: 112351
2010-08-28 03:36:51 +00:00
d0214f3efe
handle the constant case of vector insertion. For something
...
like this:
struct S { float A, B, C, D; };
struct S g;
struct S bar() {
struct S A = g;
++A.B;
A.A = 42;
return A;
}
we now generate:
_bar: ## @bar
## BB#0: ## %entry
movq _g@GOTPCREL(%rip), %rax
movss 12(%rax), %xmm0
pshufd $16, %xmm0, %xmm0
movss 4(%rax), %xmm2
movss 8(%rax), %xmm1
pshufd $16, %xmm1, %xmm1
unpcklps %xmm0, %xmm1
addss LCPI1_0(%rip), %xmm2
pshufd $16, %xmm2, %xmm2
movss LCPI1_1(%rip), %xmm0
pshufd $16, %xmm0, %xmm0
unpcklps %xmm2, %xmm0
ret
instead of:
_bar: ## @bar
## BB#0: ## %entry
movq _g@GOTPCREL(%rip), %rax
movss 12(%rax), %xmm0
pshufd $16, %xmm0, %xmm0
movss 4(%rax), %xmm2
movss 8(%rax), %xmm1
pshufd $16, %xmm1, %xmm1
unpcklps %xmm0, %xmm1
addss LCPI1_0(%rip), %xmm2
movd %xmm2, %eax
shlq $32, %rax
addq $1109917696, %rax ## imm = 0x42280000
movd %rax, %xmm0
ret
llvm-svn: 112345
2010-08-28 01:50:57 +00:00
dd6601048e
optimize bitcasts from large integers to vector into vector
...
element insertion from the pieces that feed into the vector.
This handles a pattern that occurs frequently due to code
generated for the x86-64 abi. We now compile something like
this:
struct S { float A, B, C, D; };
struct S g;
struct S bar() {
struct S A = g;
++A.A;
++A.C;
return A;
}
into all nice vector operations:
_bar: ## @bar
## BB#0: ## %entry
movq _g@GOTPCREL(%rip), %rax
movss LCPI1_0(%rip), %xmm1
movss (%rax), %xmm0
addss %xmm1, %xmm0
pshufd $16, %xmm0, %xmm0
movss 4(%rax), %xmm2
movss 12(%rax), %xmm3
pshufd $16, %xmm2, %xmm2
unpcklps %xmm2, %xmm0
addss 8(%rax), %xmm1
pshufd $16, %xmm1, %xmm1
pshufd $16, %xmm3, %xmm2
unpcklps %xmm2, %xmm1
ret
instead of icky integer operations:
_bar: ## @bar
movq _g@GOTPCREL(%rip), %rax
movss LCPI1_0(%rip), %xmm1
movss (%rax), %xmm0
addss %xmm1, %xmm0
movd %xmm0, %ecx
movl 4(%rax), %edx
movl 12(%rax), %esi
shlq $32, %rdx
addq %rcx, %rdx
movd %rdx, %xmm0
addss 8(%rax), %xmm1
movd %xmm1, %eax
shlq $32, %rsi
addq %rax, %rsi
movd %rsi, %xmm1
ret
This resolves rdar://8360454
llvm-svn: 112343
2010-08-28 01:20:38 +00:00
18d7fc8fc6
Implement a pretty general logical shift propagation
...
framework, which is good at ripping through bitfield
operations. This generalize a bunch of the existing
xforms that instcombine does, such as
(x << c) >> c -> and
to handle intermediate logical nodes. This is useful for
ripping up the "promote to large integer" code produced by
SRoA.
llvm-svn: 112304
2010-08-27 22:24:38 +00:00
7398434675
teach the truncation optimization that an entire chain of
...
computation can be truncated if it is fed by a sext/zext that doesn't
have to be exactly equal to the truncation result type.
llvm-svn: 112285
2010-08-27 20:32:06 +00:00
90cd746e63
Add an instcombine to clean up a common pattern produced
...
by the SRoA "promote to large integer" code, eliminating
some type conversions like this:
%94 = zext i16 %93 to i32 ; <i32> [#uses=2]
%96 = lshr i32 %94, 8 ; <i32> [#uses=1]
%101 = trunc i32 %96 to i8 ; <i8> [#uses=1]
This also unblocks other xforms from happening, now clang is able to compile:
struct S { float A, B, C, D; };
float foo(struct S A) { return A.A + A.B+A.C+A.D; }
into:
_foo: ## @foo
## BB#0: ## %entry
pshufd $1, %xmm0, %xmm2
addss %xmm0, %xmm2
movdqa %xmm1, %xmm3
addss %xmm2, %xmm3
pshufd $1, %xmm1, %xmm0
addss %xmm3, %xmm0
ret
on x86-64, instead of:
_foo: ## @foo
## BB#0: ## %entry
movd %xmm0, %rax
shrq $32, %rax
movd %eax, %xmm2
addss %xmm0, %xmm2
movapd %xmm1, %xmm3
addss %xmm2, %xmm3
movd %xmm1, %rax
shrq $32, %rax
movd %eax, %xmm0
addss %xmm3, %xmm0
ret
This seems pretty close to optimal to me, at least without
using horizontal adds. This also triggers in lots of other
code, including SPEC.
llvm-svn: 112278
2010-08-27 18:31:05 +00:00
bfd2228182
optimize "integer extraction out of the middle of a vector" as produced
...
by SRoA. This is part of rdar://7892780, but needs another xform to
expose this.
llvm-svn: 112232
2010-08-26 22:14:59 +00:00
d4ebd6df5a
optimize bitcast(trunc(bitcast(x))) where the result is a float and 'x'
...
is a vector to be a vector element extraction. This allows clang to
compile:
struct S { float A, B, C, D; };
float foo(struct S A) { return A.A + A.B+A.C+A.D; }
into:
_foo: ## @foo
## BB#0: ## %entry
movd %xmm0, %rax
shrq $32, %rax
movd %eax, %xmm2
addss %xmm0, %xmm2
movapd %xmm1, %xmm3
addss %xmm2, %xmm3
movd %xmm1, %rax
shrq $32, %rax
movd %eax, %xmm0
addss %xmm3, %xmm0
ret
instead of:
_foo: ## @foo
## BB#0: ## %entry
movd %xmm0, %rax
movd %eax, %xmm0
shrq $32, %rax
movd %eax, %xmm2
addss %xmm0, %xmm2
movd %xmm1, %rax
movd %eax, %xmm1
addss %xmm2, %xmm1
shrq $32, %rax
movd %eax, %xmm0
addss %xmm1, %xmm0
ret
... eliminating half of the horribleness.
llvm-svn: 112227
2010-08-26 21:55:42 +00:00
84774eda4b
Tweak per Chris' comments.
...
llvm-svn: 108736
2010-07-19 19:23:32 +00:00
32a58342ed
Reimplement r108639 in InstCombine rather than DAGCombine.
...
llvm-svn: 108687
2010-07-19 08:09:34 +00:00
05a6555acb
Fix instcombine's handling of alloca to accept non-i32 types.
...
llvm-svn: 104935
2010-05-28 04:33:04 +00:00
a4abd035ea
Fix a missing newline in debug output.
...
llvm-svn: 104644
2010-05-25 21:50:35 +00:00
02b0df5338
Teach instcombine to transform a bitcast/(zext|trunc)/bitcast sequence
...
with a vector input and output into a shuffle vector. This sort of
sequence happens when the input code stores with one type and reloads
with another type and then SROA promotes to i96 integers, which make
everyone sad.
This fixes rdar://7896024
llvm-svn: 103354
2010-05-08 21:50:26 +00:00
eb7111b98f
Say bitcast instead of bitconvert.
...
llvm-svn: 100720
2010-04-07 23:22:42 +00:00
19d0b47b1f
There are two ways of checking for a given type, for example isa<PointerType>(T)
...
and T->isPointerTy(). Convert most instances of the first form to the second form.
Requested by Chris.
llvm-svn: 96344
2010-02-16 11:11:14 +00:00
9dff9bec31
Uniformize the names of type predicates: rather than having isFloatTy and
...
isInteger, we now have isFloatTy and isIntegerTy. Requested by Chris!
llvm-svn: 96223
2010-02-15 16:12:20 +00:00
4e8137d678
Rename ValueRequiresCast to ShouldOptimizeCast, to better reflect
...
what it does. Enhance it to return false to optimizing vector
sign extensions from vector comparisions, which is the idiom used
to get a splatted vector for a vector comparison.
Doing this breaks vector-casts.ll, add some compensating
transformations to handle the important case they cover without
depending on this canonicalization.
This fixes rdar://7434900 a serious pessimization of vector compares.
llvm-svn: 95855
2010-02-11 06:26:33 +00:00
949458d014
LangRef.html says that inttoptr and ptrtoint always use zero-extension
...
when the cast is extending.
llvm-svn: 95046
2010-02-02 01:44:02 +00:00
1b35bbe813
change the canonical form of "cond ? -1 : 0" to be
...
"sext cond" instead of a select. This simplifies some instcombine
code, matches the policy for zext (cond ? 1 : 0 -> zext), and allows
us to generate better code for a testcase on ppc.
llvm-svn: 94339
2010-01-24 00:09:49 +00:00
43f2fa6201
my instcombine transformations to make extension elimination more
...
aggressive changed the canonical form from sext(trunc(x)) to ashr(lshr(x)),
make sure to transform a couple more things into that canonical form,
and catch a case where we missed turning zext/shl/ashr into a single sext.
llvm-svn: 93787
2010-01-18 22:19:16 +00:00
d1a3efedd8
reenable the piece that turns trunc(zext(x)) -> x even if zext has multiple uses,
...
codegen has no apparent problem with the trunc version of this, because it turns
into a simple subreg idiom
llvm-svn: 93202
2010-01-11 22:49:40 +00:00
a6b1356cf9
Disable folding sext(trunc(x)) -> x (and other similar cast/cast cases) when the
...
trunc has multiple uses. Codegen is not able to coalesce the subreg case
correctly and so this leads to higher register pressure and spilling (see PR5997).
This speeds up 256.bzip2 from 8.60 -> 8.04s on my machine, ~7%.
llvm-svn: 93200
2010-01-11 22:45:25 +00:00
0a85420409
Extend CanEvaluateZExtd to handle and/or/xor more aggressively in the
...
BitsToClear case. This allows it to promote expressions which have an
and/or/xor after the lshr, promoting cases like test2 (from PR4216)
and test3 (random extample extracted from a spec benchmark).
clang now compiles the code in PR4216 into:
_test_bitfield: ## @test_bitfield
movl %edi, %eax
orl $194, %eax
movl $4294902010, %ecx
andq %rax, %rcx
orl $32768, %edi
andq $39936, %rdi
movq %rdi, %rax
orq %rcx, %rax
ret
instead of:
_test_bitfield: ## @test_bitfield
movl %edi, %eax
orl $194, %eax
movl $4294902010, %ecx
andq %rax, %rcx
shrl $8, %edi
orl $128, %edi
shlq $8, %rdi
andq $39936, %rdi
movq %rdi, %rax
orq %rcx, %rax
ret
which is still not great, but is progress.
llvm-svn: 93145
2010-01-11 04:05:13 +00:00
12bd8992b3
Remove the dead TD argument to CanEvaluateZExtd, and add a
...
new BitsToClear result which allows us to start promoting
expressions that end with a lshr-by-constant. This is
conservatively correct and better than what we had before
(see testcases) but still needs to be extended further.
llvm-svn: 93144
2010-01-11 03:32:00 +00:00
172630abd2
improve comments, remove dead TD argument to CanEvaluateSExtd.
...
llvm-svn: 93143
2010-01-11 02:43:35 +00:00
7dd540ee24
teach sext optimization to handle truncs from types that are not
...
the dest of the sext.
llvm-svn: 93128
2010-01-10 20:30:41 +00:00
39d2daa94c
teach zext optimization how to deal with truncs that don't come from
...
the zext dest type. This allows us to handle test52/53 in cast.ll,
and allows llvm-gcc to generate much better code for PR4216 in -m64
mode:
_test_bitfield: ## @test_bitfield
orl $32962, %edi
movl %edi, %eax
andl $-25350, %eax
ret
This also fixes a bug handling vector extends, ensuring that the
mask produced is a vector constant, not an integer constant.
llvm-svn: 93127
2010-01-10 20:25:54 +00:00
1a05fddcdc
simplify CanEvaluateSExtd to return a bool now that we have a
...
simpler profitability predicate.
llvm-svn: 93111
2010-01-10 07:57:20 +00:00
d7816780e2
the NumCastsRemoved argument to CanEvaluateSExtd is dead, remove it.
...
llvm-svn: 93110
2010-01-10 07:42:21 +00:00
2fff10c424
now that the cost model has changed, we can always consider
...
elimination of a sign extend to be a win, which simplifies
the client of CanEvaluateSExtd, and allows us to eliminate
more casts (examples taken from real code).
llvm-svn: 93109
2010-01-10 07:40:50 +00:00
d8509424a4
change the preferred canonical form for a sign extension to be
...
lshr+ashr instead of trunc+sext. We want to avoid type
conversions whenever possible, it is easier to codegen expressions
without truncates and extensions.
llvm-svn: 93107
2010-01-10 07:08:30 +00:00
127bbc715e
fix pasto that broke bootstrap.
...
llvm-svn: 93105
2010-01-10 06:50:04 +00:00
b7be7cc486
simplify CanEvaluateZExtd now that we don't care about the number of
...
bits known clear in the result and don't care about the # casts
eliminated. TD is also dead but keeping it for now.
llvm-svn: 93098
2010-01-10 02:50:04 +00:00
49d2c9764d
two changes:
...
1) don't try to optimize a sext or zext that is only used by a trunc, let
the trunc get optimized first. This avoids some pointless effort in
some common cases since instcombine scans down a block in the first pass.
2) Change the cost model for zext elimination to consider an 'and' cheaper
than a zext. This allows us to do it more aggressively, and for the next
patch to simplify the code quite a bit.
llvm-svn: 93097
2010-01-10 02:39:31 +00:00
f0af17dab3
enhance CanEvaluateZExtd to handle shift left and sext, allowing
...
more expressions to be promoted and casts eliminated.
llvm-svn: 93096
2010-01-10 02:22:12 +00:00
7723e2b10f
remove an xform subsumed by EvaluateInDifferentType.
...
llvm-svn: 93095
2010-01-10 01:35:55 +00:00
c95a7a21b7
clean up this xform by using m_Trunc.
...
llvm-svn: 93092
2010-01-10 01:04:31 +00:00
883550afe8
inline and remove the rest of commonIntCastTransforms.
...
llvm-svn: 93091
2010-01-10 01:00:46 +00:00
c3aca38468
Inline the expression type promotion/demotion stuff out of
...
commonIntCastTransforms into the callers, eliminating a switch,
and allowing the static predicate methods to be moved down to
live next to the corresponding function. No functionality
change.
llvm-svn: 93089
2010-01-10 00:58:42 +00:00
9242ae047c
mplement a theoretical fixme.
...
llvm-svn: 93024
2010-01-08 19:28:47 +00:00
10840e9e13
rename CanEvaluateInDifferentType -> CanEvaluateTruncated and
...
simplify it now that it is only used for truncates.
llvm-svn: 93021
2010-01-08 19:19:23 +00:00
3057c37959
Enhance instcombine to reason more strongly about promoting computation
...
that feeds into a zext, similar to the patch I did yesterday for sext.
There is a lot of room for extension beyond this patch.
llvm-svn: 92962
2010-01-07 23:41:00 +00:00
4339f2abdb
tweaks suggested by Duncan
...
llvm-svn: 92824
2010-01-06 05:32:15 +00:00
98748c0964
Teach instcombine's sext elimination logic to be more aggressive.
...
Previously, instcombine would only promote an expression tree to
the larger type if doing so eliminated two casts. This is because
a need to manually do the sign extend after the promoted expression
tree with two shifts. Now, we keep track of whether the result of
the computation is going to be properly sign extended already. If
so, we can unconditionally promote the expression, which allows us
to zap more sext's.
This implements rdar://6598839 (aka gcc pr38751)
llvm-svn: 92815
2010-01-06 01:56:21 +00:00
8600dd3d7c
simplify this code.
...
llvm-svn: 92800
2010-01-05 23:00:30 +00:00
554d0564ff
make this a static function instead of a method.
...
llvm-svn: 92795
2010-01-05 22:30:42 +00:00
a93c63c22d
more rearrangement and cleanup, fix my test failure.
...
llvm-svn: 92792
2010-01-05 22:21:18 +00:00
f476ef502c
cleanup
...
llvm-svn: 92790
2010-01-05 22:07:33 +00:00
f88dd5ed64
remove two trunc xforms that are subsumed by EvaluateInDifferentType.
...
The only difference is that EvaluateInDifferentType checks to ensure
they are profitable before doing them :)
llvm-svn: 92788
2010-01-05 22:01:41 +00:00
44a63815b9
just remove this xform which is subsumed by others.
...
llvm-svn: 92775
2010-01-05 21:16:30 +00:00
b82a840eb2
move a trunc-specific transform out of commonIntCastTransforms into visitTrunc.
...
llvm-svn: 92773
2010-01-05 21:11:17 +00:00
fd7e42b65d
move a zext specific xform out of commonIntCastTransforms into visitZExt and modernize it.
...
llvm-svn: 92770
2010-01-05 21:04:47 +00:00
aaccc8de62
move a trunc-specific xform out of commonIntCastTransforms into visitTrunc
...
llvm-svn: 92768
2010-01-05 20:57:30 +00:00
a81a6dff0d
Convert a ton of simple integer type equality tests to the new predicate.
...
llvm-svn: 92760
2010-01-05 20:07:06 +00:00
ccce8bae14
Avoid going through the LLVMContext for type equality where it's safe to dereference the type pointer.
...
llvm-svn: 92726
2010-01-05 13:12:22 +00:00
59d95743c8
move some more cast-related stuff
...
llvm-svn: 92471
2010-01-04 07:59:07 +00:00
92be2adba6
move the [Can]EvaluateInDifferentType functions out to InstCombineCasts.cpp
...
llvm-svn: 92469
2010-01-04 07:54:59 +00:00
2b295a0eba
split 943 lines of instcombine out to a new InstCombineCasts.cpp
...
file. InstructionCombining.cpp is now down to a svelte 9300 lines :)
llvm-svn: 92468
2010-01-04 07:53:58 +00:00
Duncan Sands