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31 Commits

Author SHA1 Message Date
Argyrios Kyrtzidis
acb8d9fbe3 Eliminate redundant bitwise operations when using a llvm/ADT/PointerUnion. 
For comparison, with this code sample:

PointerUnion<int *, char *> Data;
PointerUnion<int *, char *> foo1() {
	Data = new int;
	return new int;
}
PointerUnion<int *, char *> foo2() {
	Data = new char;
	return new char;
}

Before this patch we would get:

define i64 @_Z4foo1v() uwtable ssp {
  %1 = tail call noalias i8* @_Znwm(i64 4)
  %2 = ptrtoint i8* %1 to i64
  %3 = load i64* getelementptr inbounds (%"class.llvm::PointerUnion"* @Data, i64 0, i32 0, i32 0), align 8
  %4 = and i64 %3, 1
  %.masked.i = and i64 %2, -3
  %5 = or i64 %4, %.masked.i
  store i64 %5, i64* getelementptr inbounds (%"class.llvm::PointerUnion"* @Data, i64 0, i32 0, i32 0), align 8
  %6 = tail call noalias i8* @_Znwm(i64 4)
  %7 = ptrtoint i8* %6 to i64
  %8 = and i64 %7, -3
  ret i64 %8
}

define i64 @_Z4foo2v() uwtable ssp {
  %1 = tail call noalias i8* @_Znwm(i64 1)
  %2 = ptrtoint i8* %1 to i64
  %3 = load i64* getelementptr inbounds (%"class.llvm::PointerUnion"* @Data, i64 0, i32 0, i32 0), align 8
  %4 = and i64 %3, 1
  %5 = or i64 %2, %4
  %6 = or i64 %5, 2
  store i64 %6, i64* getelementptr inbounds (%"class.llvm::PointerUnion"* @Data, i64 0, i32 0, i32 0), align 8
  %7 = tail call noalias i8* @_Znwm(i64 1)
  %8 = ptrtoint i8* %7 to i64
  %9 = or i64 %8, 2
  ret i64 %9
}

After the patch:

define i64 @_Z4foo1v() uwtable ssp {
  %1 = tail call noalias i8* @_Znwm(i64 4)
  %2 = ptrtoint i8* %1 to i64
  store i64 %2, i64* getelementptr inbounds (%"class.llvm::PointerUnion"* @Data, i64 0, i32 0, i32 0), align 8
  %3 = tail call noalias i8* @_Znwm(i64 4)
  %4 = ptrtoint i8* %3 to i64
  ret i64 %4
}

declare noalias i8* @_Znwm(i64)

define i64 @_Z4foo2v() uwtable ssp {
  %1 = tail call noalias i8* @_Znwm(i64 1)
  %2 = ptrtoint i8* %1 to i64
  %3 = or i64 %2, 2
  store i64 %3, i64* getelementptr inbounds (%"class.llvm::PointerUnion"* @Data, i64 0, i32 0, i32 0), align 8
  %4 = tail call noalias i8* @_Znwm(i64 1)
  %5 = ptrtoint i8* %4 to i64
  %6 = or i64 %5, 2
  ret i64 %6
}

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169147 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-12-03 19:59:23 +00:00
Richard Smith
1144af3c9b Fix integer undefined behavior due to signed left shift overflow in LLVM. 
Reviewed offline by chandlerc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162623 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-08-24 23:29:28 +00:00
Jordan Rose
6ef4996b09 Allow PointerIntPairs to be created from const void *. 
For a measure of safety, this conversion is only permitted if the
stored pointer type can also be created from a const void *.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160456 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-07-18 21:58:49 +00:00
Argyrios Kyrtzidis
0db235a2b0 PointerUnion::getAddrOf() does not need to be template since we can only 
use the first pointer type for it. Rename it to getAddrOfPtr1().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152106 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-06 07:14:54 +00:00
Argyrios Kyrtzidis
38297f5f76 Allow getting the address of the value in a PointerUnion or PointerIntPair if one is 
confident enough that he knows what he is doing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126019 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-19 03:55:58 +00:00
Chris Lattner
4bbf4ee149 Remove isPod() from DenseMapInfo, splitting it out to its own 
isPodLike type trait.  This is a generally useful type trait for
more than just DenseMap, and we really care about whether something
acts like a pod, not whether it really is a pod.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91421 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-12-15 07:26:43 +00:00
John McCall
2fed70daaf Fix a few places where PointerIntPair was using PointerLikeTypeTraits<PointerTy> 
instead of the PtrTraits provided.  Allows PointerIntPair to contain a
PointerUnion safely, as long as the bits add up.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82163 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-09-17 20:35:18 +00:00
Bill Wendling
3485d25a0e I cast, therefore I think I know what I'm doing. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70151 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-26 20:12:38 +00:00
Bill Wendling
b14a495c36 Use uint64_t instead of unsigned. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70148 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-26 19:46:41 +00:00
Chris Lattner
1e8db00e3b revert an incorrect patch. This causes crashes all over the place on a 
64-bit build.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70147 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-26 19:44:20 +00:00
Bill Wendling
610cb31ac9 Suppress warnings about conversion shortening 64-bit to 32-bit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70138 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-04-26 18:10:20 +00:00
Chris Lattner
c6a4b6b78b fix the PointerLikeTypeTraits specialization for PointerIntPair to 
allow the traits to be specified as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68055 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-30 20:28:50 +00:00
Chris Lattner
54e01d06db add missing space. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67995 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-29 13:26:05 +00:00
Chris Lattner
f341a47d10 When forming sentinels for empty/tombstone, make sure to respect the 
pointer's expected number of zero low-bits.

This should fix the breakage I introduced recently.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67990 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-29 06:33:22 +00:00
Chris Lattner
540db8bcb8 Allow a specific PointerIntPair instance to use a specific Pointer trait: 
some pointer instances have properties that not all of a type have.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67986 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-29 06:02:20 +00:00
Chris Lattner
e30173ac33 Replace the PointerLikeTypeTraits::getNumLowBitsAvailable 
function with a new NumLowBitsAvailable enum, which makes the
value available as an integer constant expression.

Add PointerLikeTypeTraits specializations for Instruction* and
Use** since they are only guaranteed 4-byte aligned.

Enhance PointerIntPair to know about (and enforce) the alignment
specified by PointerLikeTypeTraits.  This should allow things 
like PointerIntPair<PointerIntPair<void*, 1,bool>, 1, bool> 
because the inner one knows that 2 low bits are free.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67979 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-29 04:32:37 +00:00
Chris Lattner
8ee1b5e916 rename PointerLikeTypeInto to PointerLikeTypeTraits, add trait for 
# low bits free, and move to its own header.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67973 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-29 00:39:30 +00:00
Chris Lattner
4d4177b9b3 teach SmallPtrSet that PointerIntPair is "basically a pointer". 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67970 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-03-29 00:18:42 +00:00
Duncan Sands
6ea5776f51 Get this building with gcc-4.4. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62322 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-16 15:54:57 +00:00
Misha Brukman
3a54b3dc87 Removed trailing whitespace. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62000 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-01-09 19:25:42 +00:00
Dan Gohman
b79a01111d Move the conversion to intptr_t to a separate statement. This 
avoids GCC's warning even on 64-bit hosts.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60706 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-08 17:41:24 +00:00
Dan Gohman
994fd5354b Use intptr_t instead of unsigned here, which is more appropriate 
in a really obscure way, but more importantly has the side effect
of avoiding a GCC warning in the case that IntType is bool.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60677 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-12-07 21:28:00 +00:00
Chris Lattner
012618f0fc add the rest of the comparison routines. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60303 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-30 19:10:41 +00:00
Torok Edwin
10ca770020 protect against negative values that would exceed allowed bit width 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60239 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-29 08:52:45 +00:00
Chris Lattner
b9cf75a15f apparently GCC doesn't believe that I understand C 
precedence rules.  Pacify it.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60237 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-29 08:36:39 +00:00
Duncan Sands
3f7dba7b17 Typo fix. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60236 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-29 08:03:35 +00:00
Chris Lattner
d63e618212 Fix sentinels to use correctly 'aligned' pointers. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60229 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-29 01:36:16 +00:00
Chris Lattner
9ac30537aa Fix spello, add DenseMapInfo specialization for PointerIntPair. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60228 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-29 01:18:05 +00:00
Chris Lattner
d55da4de04 fix comment typo 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60227 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-28 23:57:26 +00:00
Chris Lattner
762ac83271 fix a bug. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60225 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-28 23:36:15 +00:00
Chris Lattner
34b763694e add a generic "bitmangled pointer" class, which allows a parameterized 
pointer and integer type to be used.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60224 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-11-28 23:31:44 +00:00