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19 Commits

Author SHA1 Message Date
Chris Lattner f6befffbb2 fix PR6512, a case where instcombine would incorrectly merge loads 
from different addr spaces.

llvm-svn: 97813
 2010-03-05 18:53:28 +00:00
Chris Lattner 0685be3441 enhance PHI slicing to handle the case when a slicable PHI is begin 
used by a chain of other PHIs.

llvm-svn: 86503
 2009-11-09 01:38:00 +00:00
Chris Lattner 2299d4b6d8 Teach an instcombine to not pull trunc instructions through PHI nodes 
when both the source and dest are illegal types, since it would cause
the phi to grow (for example, we shouldn't transform test14b's phi to
a phi on i320).  This fixes an infinite loop on i686 bootstrap with
phi slicing turned on, so turn it back on.

llvm-svn: 86483
 2009-11-08 21:20:06 +00:00
Chris Lattner a837e4db6b reapply r8644[3-5] with only the scary part 
(SliceUpIllegalIntegerPHI) disabled.

llvm-svn: 86480
 2009-11-08 19:23:30 +00:00
Daniel Dunbar 4c41373c56 Speculatively revert r8644[3-5], they seem to be leading to infinite loops in 
llvm-gcc bootstrap.

llvm-svn: 86478
 2009-11-08 17:52:47 +00:00
Chris Lattner 99db7963b4 another more interesting test. 
llvm-svn: 86445
 2009-11-08 08:36:40 +00:00
Chris Lattner 7c8b29ef61 feature test for the new transformation in r86443 
llvm-svn: 86444
 2009-11-08 08:30:58 +00:00
Chris Lattner c7a450b5b2 teach a couple of instcombine transformations involving PHIs to 
not turn a PHI in a legal type into a PHI of an illegal type, and
add a new optimization that breaks up insane integer PHI nodes into
small pieces (PR3451).

llvm-svn: 86443
 2009-11-08 08:21:13 +00:00
Chris Lattner 3e6398baa5 merge phi-merge.ll into phi.ll 
I don't know what Dan wants to do with phi-merge-gep.ll, I'll let
him deal with it because instcombine may end up sinking these.

llvm-svn: 85739
 2009-11-01 20:10:11 +00:00
Chris Lattner 328ef89bd1 when merging two loads, make sure to take the min of their alignment, 
not the max.  This didn't matter until the previous patch because
instcombine would refuse to sink loads with differenting alignments.

llvm-svn: 85738
 2009-11-01 20:07:07 +00:00
Chris Lattner 0b40a8bc0e fix a bug noticed by inspection: when instcombine sinks loads through 
phis, it didn't preserve the alignment of the load.  This is a missed
optimization of the alignment is high and a miscompilation when the
alignment is low.

llvm-svn: 85736
 2009-11-01 19:50:13 +00:00
Chris Lattner d162b5c955 convert to filecheck. 
llvm-svn: 85734
 2009-11-01 19:22:20 +00:00
Dan Gohman 72a13d2476 Use opt -S instead of piping bitcode output through llvm-dis. 
llvm-svn: 81257
 2009-09-08 22:34:10 +00:00
Dan Gohman 9737a63ed8 Change these tests to feed the assembly files to opt directly, instead 
of using llvm-as, now that opt supports this.

llvm-svn: 81226
 2009-09-08 16:50:01 +00:00
Chris Lattner 9d02a70a7d Teach inst combine to merge GEPs through PHIs. This is really 
important because it is sinking the loads using the GEPs, but
not the GEPs themselves.  This triggers 647 times on 403.gcc
and makes the .s file much much nicer.  For example before:

        je      LBB1_87 ## bb78
LBB1_62:        ## bb77
        leal    84(%esi), %eax
LBB1_63:        ## bb79
        movl    (%eax), %eax
...
LBB1_87:        ## bb78
        movl    $0, 4(%esp)
        movl    %esi, (%esp)
        call    L_make_decl_rtl$stub
        jmp     LBB1_62 ## bb77


after:

        jne     LBB1_63 ## bb79
LBB1_62:        ## bb78
        movl    $0, 4(%esp)
        movl    %esi, (%esp)
        call    L_make_decl_rtl$stub
LBB1_63:        ## bb79
        movl    84(%esi), %eax

The input code was (and the GEPs are merged and
the PHI is now eliminated by instcombine):

        br i1 %tmp233, label %bb78, label %bb77
bb77:           
        %tmp234 = getelementptr %struct.tree_node* %t_addr.3, i32 0, i32 0, i32 22              
        br label %bb79
bb78:           
        call void @make_decl_rtl(%struct.tree_node* %t_addr.3, i8* null) nounwind
        %tmp235 = getelementptr %struct.tree_node* %t_addr.3, i32 0, i32 0, i32 22              
        br label %bb79
bb79:           
        %iftmp.12.0.in = phi %struct.rtx_def** [ %tmp235, %bb78 ], [ %tmp234, %bb77 ]           
        %iftmp.12.0 = load %struct.rtx_def** %iftmp.12.0.in             

llvm-svn: 60322
 2008-12-01 02:34:36 +00:00
Tanya Lattner 5640bd186a Remove llvm-upgrade and update test cases. 
llvm-svn: 47793
 2008-03-01 09:15:35 +00:00
Reid Spencer ede8c3b92c For PR1319: 
Make use of the END. facility on all files > 1K so that we aren't wasting CPU
cycles searching for RUN: lines that we'll never find.

llvm-svn: 36059
 2007-04-15 07:38:21 +00:00
Reid Spencer 91948d4cad For PR1319: 
Upgrade tests to work with new llvm.exp version of llvm_runtest.

llvm-svn: 36013
 2007-04-14 20:13:02 +00:00
Reid Spencer 83b3d82672 Regression is gone, don't try to find it on clean target. 
llvm-svn: 33296
 2007-01-17 07:59:14 +00:00