search for: cmplwi

Evan, et al., I've come across a small issue when using the if conversion pass in PPC to generate conditional returns. Here's a small example: ** Before if conversion ** BB#0: derived from LLVM BB %entry %R3<def> = LI 0 %CR0<def> = CMPLWI %R3, 0 BCC 68, %CR0, <BB#3> Successors according to CFG: BB#3(16) BB#1(16) BB#1: derived from LLVM BB %while.body.lr.ph Live Ins: %R3 Predecessors according to CFG: BB#0 %CR0<def> = CMPLWI %R3<kill>, 0 BCC 68, %CR0, <BB#3> Successors...

...r-84c835.s:7671: Error: operand out of range (0x0000000000008004 is not between 0xffffffffffff8000 and 0x0000000000007ffc) The offending line is the bne branch in this snippet: .LBB24_787: ld 3, 16(29) ld 4, 24(29) sub 4, 4, 3 rldicl 4, 4, 60, 4 cmplwi 0, 4, 3 bne 0, .LBB24_2630 Could this be because of a recent change in the PowerPC code generator or just because PPCInstPrinter.cpp changed a bit and exposed a pre-existing bug? -Rich

On 2008-06-11, at 13:16, Gary Benson wrote: > Duncan Sands wrote: > >> Can you please attach IR which can be compiled to an executable >> (and shows the problem). > > I've been generating functions using a builder and then compiling > them with ExecutionEngine::getPointerToFunction(). Is there some way > I can get compilable IR from that?

...ubyte 97, label %ret_true ubyte 98, label %ret_true ] Unfortunately, this generates really weird code on the LLVM 1.6 PowerPC backend: LBB_matches_1: ; regex6 lbz r4, 0(r3) LBB_matches_2: ; NodeBlock rlwinm r5, r4, 0, 24, 31 cmplwi cr0, r5, 98 blt cr0, LBB_matches_4 ; LeafBlock LBB_matches_3: ; LeafBlock1 rlwinm r4, r4, 0, 24, 31 cmpwi cr0, r4, 98 beq cr0, LBB_matches_8 ; ret_true b LBB_matches_5 ; NewDefault LBB_matches_4: ; LeafBlock rlwinm r4, r4, 0, 24, 31...

Duncan Sands wrote: > Can you please attach IR which can be compiled > to an executable (and shows the problem). I've been generating functions using a builder and then compiling them with ExecutionEngine::getPointerToFunction(). Is there some way I can get compilable IR from that? Cheers, Gary -- http://gbenson.net/

...and > > 0x0000000000007ffc) > > > > The offending line is the bne branch in this snippet: > > > > .LBB24_787: > > ld 3, 16(29) > > ld 4, 24(29) > > sub 4, 4, 3 > > rldicl 4, 4, 60, 4 > > cmplwi 0, 4, 3 > > bne 0, .LBB24_2630 > > > > Could this be because of a recent change in the PowerPC code > > generator > > or just because PPCInstPrinter.cpp changed a bit and exposed a > > pre-existing bug? > > > > > > -Rich > &g...

...4, 26 2652: bl print_value 2653: la 3, dump57 at l(13) 2654: mr 4, 27 2655: bl print_value 2656: ori 4, 21, 7712 2657: li 3, 634 2658: bl trace_bytecode 2659: lis 3, 4031 2660: lwz 3, -12952(3) 2661: cmplwi 0, 3, 1 2662: beq 0, BB10_218 # do_safepoint 2663: BB10_41: # safepointed 2664: cmpw 0, 27, 26 2665: bge 0, BB10_169 # bci_637 2666: BB10_42: # bci_132 2667: lis 21, 3984 2668: ori 4, 21, 6756 2669: li 3, 132 2670:...

On Mar 17, 2006, at 7:54 AM, Eric Kidd wrote: > Unfortunately, this generates really weird code on the LLVM 1.6 > PowerPC backend: > > LBB_matches_1: ; regex6 > lbz r4, 0(r3) > LBB_matches_2: ; NodeBlock > rlwinm r5, r4, 0, 24, 31 > cmplwi cr0, r5, 98 > blt cr0, LBB_matches_4 ; LeafBlock > LBB_matches_3: ; LeafBlock1 > rlwinm r4, r4, 0, 24, 31 > cmpwi cr0, r4, 98 > beq cr0, LBB_matches_8 ; ret_true > b LBB_matches_5 ; NewDefault > LBB_matches_4: ; LeafBlock >...

On Thu, 16 Mar 2006, Eric Kidd wrote: > Hello! I'm compiling code which uses pointers as iterators. For some > reason--probably a silly misunderstanding of the docs--I can't eliminate > duplicate pointer loads. I'll probably figure this out eventually, but if > somebody else sees the answer instantly, I certainly won't complain. :-) There are no stupid questions.

Hello! I'm compiling code which uses pointers as iterators. For some reason--probably a silly misunderstanding of the docs--I can't eliminate duplicate pointer loads. I'll probably figure this out eventually, but if somebody else sees the answer instantly, I certainly won't complain. :-) Here are the optimizers I'm running: opt -f -simplifycfg -dce -instcombine