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Author SHA1 Message Date
Nick Lewycky
6410510224 Enable the fix I just checked in, silly me. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46247 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-22 05:42:02 +00:00
Nick Lewycky
e6b0c0036a Multiply can be evaluated in a different type, so long as the target type has 
a smaller bitwidth.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46244 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-22 05:08:48 +00:00
Duncan Sands
e003813e96 Make sure the caller doesn't use freed memory. 
Fixes PR1935.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46203 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-20 16:51:46 +00:00
Duncan Sands
02ec6e51ed Initializing an unsigned with ~0UL causes the compiler 
to complain on x86-64 (gcc 4.1).  Use ~0U instead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46197 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-20 10:49:23 +00:00
Evan Cheng
b2fc2a330a DAE bug fix. Don't lose parameter attributes on vararg arguments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46113 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-17 04:18:54 +00:00
Chris Lattner
ab04e13a1f Fix arg promotion to propagate the correct attrs on the calls to 
promoted functions.  This is important for varargs calls in 
particular.  Thanks to duncan for providing a great testcase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46108 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-17 01:17:03 +00:00
Chris Lattner
1e9aa716e9 Handle attribute(used) global variables that are i8. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46090 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-16 21:35:43 +00:00
Devang Patel
8c231e5dda Do not strip llvm.used values. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46045 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-16 03:33:05 +00:00
Duncan Sands
b0c9b93bb4 I noticed that the trampoline straightening transformation could 
drop attributes on varargs call arguments.  Also, it could generate
invalid IR if the transformed call already had the 'nest' attribute
somewhere (this can never happen for code coming from llvm-gcc,
but it's a theoretical possibility).  Fix both problems.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45973 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-14 19:52:09 +00:00
Chris Lattner
941db495b8 Fix the miscompilation of MiBench/consumer-lame that was exposed by Evan's 
byval work.  This miscompilation is due to the program indexing an array out
of range and us doing a transformation that broke this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45949 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-14 02:09:12 +00:00
Chris Lattner
6a93fc01a7 The isNotSuitableForSRA property is now dead, don't compute it. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45948 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-14 01:32:52 +00:00
Chris Lattner
727c21084d Change SRAGlobal to not depend on isNotSuitableForSRA, which makes it very 
difficult to understand the invariants.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45947 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-14 01:31:05 +00:00
Chris Lattner
58e44f49dd Make the 'shrink global to bool' optimization more self contained, and thus 
easier to show that its safe.  No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45946 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-14 01:17:44 +00:00
Chris Lattner
37ac608623 Turn a memcpy from a double* into a load/store of double instead of 
a load/store of i64.  The later prevents promotion/scalarrepl of the
source and dest in many cases.

This fixes the 300% performance regression of the byval stuff on 
stepanov_v1p2.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45945 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-14 00:28:35 +00:00
Chris Lattner
f497b028b8 factor memcpy/memmove simplification out to its own SimplifyMemTransfer 
method, no functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45944 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-13 23:50:23 +00:00
Chris Lattner
88b39744ec simplify some code. If we can infer alignment for source and dest that are 
greater than memcpy alignment, and if we lower to load/store, use the best 
alignment info we have.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45943 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-13 22:30:28 +00:00
Chris Lattner
6d0339d451 simplify some code by adding a InsertBitCastBefore method, 
make memmove->memcpy conversion a bit simpler.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45942 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-13 22:23:22 +00:00
Chris Lattner
ee2b7a4530 Fix PR1907, a nasty miscompilation because instcombine didn't 
realize that ne & sgt  was a signed comparison (it was only 
looking at whether the left compare was signed).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45937 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-13 20:59:02 +00:00
Duncan Sands
e3a8830c1d Small simplification. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45932 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-13 08:12:17 +00:00
Duncan Sands
e1e520f601 When turning a call to a bitcast function into a direct call, 
if this becomes a varargs call then deal correctly with any
parameter attributes on the newly vararg call arguments.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45931 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-13 08:02:44 +00:00
Chris Lattner
92938b7145 we don't have to make an explicit copy of a byval argument when 
inlining a function if we know that the function does not write
to *any* memory.  This implements test/Transforms/Inline/byval2.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45912 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-12 18:54:29 +00:00
Chris Lattner
120d053e3b Allow clients to specify the inline threshold when creating 
the inliner pass.  Patch by Robert Zeh.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45903 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-12 06:49:13 +00:00
Duncan Sands
bfc5ae6df0 When DAE drops the varargs part of a function, ensure any 
attributes on the vararg call arguments are also dropped.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45892 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-11 23:13:45 +00:00
Chris Lattner
10603e0c84 Teach argpromote to ruthlessly hack small byval structs when it can 
get away with it, which exposes opportunities to eliminate the memory
objects entirely.  For example, we now compile byval.ll to:

define internal void @f1(i32 %b.0, i64 %b.1) {
entry:
	%tmp2 = add i32 %b.0, 1		; <i32> [#uses=0]
	ret void
}

define i32 @main() nounwind  {
entry:
	call void @f1( i32 1, i64 2 )
	ret i32 0
}

This seems like it would trigger a lot for code that passes around small
structs (e.g. SDOperand's or _Complex)...



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45886 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-11 22:31:41 +00:00
Chris Lattner
e027efa218 Use smallptrset instead of std::set for efficiency. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45878 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-11 19:36:30 +00:00
Chris Lattner
170b1816b2 a byval argument is guaranteed to be valid to load. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45877 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-11 19:34:32 +00:00
Chris Lattner
40c14be5bc Update this code to use eraseFromParent where possible. Compute 
whether an argument is byval and pass into isSafeToPromoteArgument.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45876 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-11 19:20:39 +00:00
Chris Lattner
f1577014dd replace a loop with a constant time check. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45875 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-11 18:55:10 +00:00
Chris Lattner
6e8410abf1 another minor datastructure tweak. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45874 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-11 18:47:45 +00:00
Chris Lattner
a10145fdf6 start using smallvector to avoid vector heap thrashing. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45873 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-11 18:43:58 +00:00
Chris Lattner
c93adca358 When inlining a functino with a byval argument, make an explicit 
copy of it in case the callee modifies the struct.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45853 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-11 06:09:30 +00:00
Chris Lattner
f9d9e45225 Implement PR1795, an instcombine hack for forming GEPs with integer pointer arithmetic. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45745 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-08 07:23:51 +00:00
Duncan Sands
6c3470efdc Small cleanup for handling of type/parameter attribute 
incompatibility.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45704 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-07 17:16:06 +00:00
Gordon Henriksen
9bb0681028 Deleting an empty file. Thanks, /usr/bin/patch! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45675 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-07 02:29:04 +00:00
Gordon Henriksen
8fa8929177 With this patch, the LowerGC transformation becomes the 
ShadowStackCollector, which additionally has reduced overhead with
no sacrifice in portability.

Considering a function @fun with 8 loop-local roots,
ShadowStackCollector introduces the following overhead
(x86):

; shadowstack prologue
        movl    L_llvm_gc_root_chain$non_lazy_ptr, %eax
        movl    (%eax), %ecx
        movl    $___gc_fun, 20(%esp)
        movl    $0, 24(%esp)
        movl    $0, 28(%esp)
        movl    $0, 32(%esp)
        movl    $0, 36(%esp)
        movl    $0, 40(%esp)
        movl    $0, 44(%esp)
        movl    $0, 48(%esp)
        movl    $0, 52(%esp)
        movl    %ecx, 16(%esp)
        leal    16(%esp), %ecx
        movl    %ecx, (%eax)

; shadowstack loop overhead
        (none)

; shadowstack epilogue
        movl    48(%esp), %edx
        movl    %edx, (%ecx)

; shadowstack metadata
        .align  3
___gc_fun:                              # __gc_fun
        .long   8
        .space  4

In comparison to LowerGC:

; lowergc prologue
        movl    L_llvm_gc_root_chain$non_lazy_ptr, %eax
        movl    (%eax), %ecx
        movl    %ecx, 48(%esp)
        movl    $8, 52(%esp)
        movl    $0, 60(%esp)
        movl    $0, 56(%esp)
        movl    $0, 68(%esp)
        movl    $0, 64(%esp)
        movl    $0, 76(%esp)
        movl    $0, 72(%esp)
        movl    $0, 84(%esp)
        movl    $0, 80(%esp)
        movl    $0, 92(%esp)
        movl    $0, 88(%esp)
        movl    $0, 100(%esp)
        movl    $0, 96(%esp)
        movl    $0, 108(%esp)
        movl    $0, 104(%esp)
        movl    $0, 116(%esp)
        movl    $0, 112(%esp)

; lowergc loop overhead
        leal    44(%esp), %eax
        movl    %eax, 56(%esp)
        leal    40(%esp), %eax
        movl    %eax, 64(%esp)
        leal    36(%esp), %eax
        movl    %eax, 72(%esp)
        leal    32(%esp), %eax
        movl    %eax, 80(%esp)
        leal    28(%esp), %eax
        movl    %eax, 88(%esp)
        leal    24(%esp), %eax
        movl    %eax, 96(%esp)
        leal    20(%esp), %eax
        movl    %eax, 104(%esp)
        leal    16(%esp), %eax
        movl    %eax, 112(%esp)

; lowergc epilogue
        movl    48(%esp), %edx
        movl    %edx, (%ecx)

; lowergc metadata
        (none)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45670 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-07 01:30:53 +00:00
Duncan Sands
ad9a9e1559 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45658 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-06 18:27:01 +00:00
Duncan Sands
a9d0c9dc58 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45657 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-06 10:12:28 +00:00
Chris Lattner
5a62d0a038 remove a couple more unsafe xforms in the face of overflow. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45613 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-05 01:22:42 +00:00
Chris Lattner
b656601943 remove the (x-y) < 0 comparison xform, it miscompiles 
things that are not equality comparisons, for example:
   (2147479553+4096)-2147479553 < 0    !=   (2147479553+4096) < 2147479553


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45612 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-05 01:18:20 +00:00
Wojciech Matyjewicz
21a715a124 fix typo 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45594 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-04 20:02:18 +00:00
Chris Lattner
9027b3cc7f Fix PR1896 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45568 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-04 05:04:53 +00:00
Chris Lattner
3d73bce2d0 don't hoist FP additions into unconditional adds + selects. This 
could theoretically introduce a trap, but is also a performance issue.
This speeds up ptrdist/ks by 8%.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45533 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-03 07:25:26 +00:00
Chris Lattner
a114b14e5d add missing #include 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45516 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-02 23:41:05 +00:00
Chris Lattner
4ee451de36 Remove attribution from file headers, per discussion on llvmdev. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45418 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-29 20:36:04 +00:00
Chris Lattner
fc643c5e88 remove attribution from lib Makefiles. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45415 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-29 20:09:26 +00:00
Christopher Lamb
b15147ea4c Disable null pointer folding transforms for non-generic address spaces. This should probably be a target-specific predicate based on address space. That way for targets where this isn't applicable the predicate can be optimized away. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45403 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-29 07:56:53 +00:00
Chris Lattner
741c0aea08 dead calls to llvm.stacksave can be deleted, even though they 
have potential side-effects.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45392 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-29 00:59:12 +00:00
Owen Anderson
f5783f825d Repair a transform that Chris noticed a bug in. Thanks to Nicholas for pointing out my stupid mistakes when writing this patch. :-) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45384 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-28 07:42:12 +00:00
Chris Lattner
c48b138869 disable this instcombine xform, it miscompiles: 
define i32 @main() {
entry:
	%z = alloca i32		; <i32*> [#uses=2]
	store i32 0, i32* %z
	%tmp = load i32* %z		; <i32> [#uses=1]
	%sub = sub i32 %tmp, 1		; <i32> [#uses=1]
	%cmp = icmp ult i32 %sub, 0		; <i1> [#uses=1]
	%retval = select i1 %cmp, i32 1, i32 0		; <i32> [#uses=1]
	ret i32 %retval
}

into ret 1, instead of ret 0.

Christopher, please investigate.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45383 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-28 06:24:31 +00:00
Gordon Henriksen
194c90ed2a Fixing several transforms which would drop the collector attribute 
when copying functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45356 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-25 22:16:06 +00:00