search for: lbb1_7

...t; > In other words, it just extends everything to an i128 and adds. > There's no way to tell it that it can add a[i], b[i] and cy with a > single adc. (Well it could if the loop iteration wasn't messing with > the carry flag). > > Indeed, this compiles to: > > > .LBB1_7:                                # %bb.i >                                        #   Parent Loop BB1_6 Depth=1 >                                        # =>  This Inner Loop Header: Depth=2 >        addq    (%rbx,%rsi,8), %rdi >        movl    $0, %r8d >        adcq    $0, %r8 &gt...

...p.i, 999 ; <i1> [#uses=1] In other words, it just extends everything to an i128 and adds. There's no way to tell it that it can add a[i], b[i] and cy with a single adc. (Well it could if the loop iteration wasn't messing with the carry flag). Indeed, this compiles to: .LBB1_7: # %bb.i # Parent Loop BB1_6 Depth=1 # => This Inner Loop Header: Depth=2 addq (%rbx,%rsi,8), %rdi movl $0, %r8d adcq $0, %r8 addq (%r14,%...

...ends everything to an i128 and adds. >> There's no way to tell it that it can add a[i], b[i] and cy with a >> single adc. (Well it could if the loop iteration wasn't messing with >> the carry flag). >> >> Indeed, this compiles to: >> >> >> .LBB1_7: # %bb.i >> # Parent Loop BB1_6 Depth=1 >> # => This Inner Loop Header: Depth=2 >> addq (%rbx,%rsi,8), %rdi >> movl $0, %r8d >>...

...d adds. >>> There's no way to tell it that it can add a[i], b[i] and cy with a >>> single adc. (Well it could if the loop iteration wasn't messing with >>> the carry flag). >>> >>> Indeed, this compiles to: >>> >>> >>> .LBB1_7:                                # %bb.i >>>                                        #   Parent Loop BB1_6 Depth=1 >>>                                        # =>  This Inner Loop Header: Depth=2 >>>        addq    (%rbx,%rsi,8), %rdi >>>        movl    $0, %r8d...

...B1_3: ;no_exit lis r4, 21845 ori r4, r4, 21846 mulhw r4, r2, r4 addi r5, r2, -1 li r6, -1 srwi r6, r4, 31 add r4, r4, r6 mulli r4, r4, 3 li r6, 1 subf r2, r4, r2 cmpwi cr0, r2, 0 beq cr0, LBB1_9 ;no_exit LBB1_7: ;no_exit mr r2, r6 LBB1_8: ;no_exit cmpwi cr0, r5, 0 add r2, r2, r3 bgt cr0, LBB1_5 ;no_exit.no_exit_llvm_crit_edge LBB1_9: ;no_exit mr r2, r6 b LBB1_8 ;no_exit LBB1_4: ;no_exit.loopexit_llvm_crit_edge The code is this one below: void Critic...

On Fri, Jun 11, 2010 at 3:28 PM, Bill Hart <goodwillhart at googlemail.com> wrote: > Hi Eli, > > On 11 June 2010 22:44, Eli Friedman <eli.friedman at gmail.com> wrote: >> On Fri, Jun 11, 2010 at 10:37 AM, Bill Hart <goodwillhart at googlemail.com> wrote: >>> a) What plans are there to support addition, subtraction, >>> multiplication, division,

...ori r4, r4, 21846 > mulhw r4, r2, r4 > addi r5, r2, -1 > li r6, -1 > srwi r6, r4, 31 > add r4, r4, r6 > mulli r4, r4, 3 > li r6, 1 > subf r2, r4, r2 > cmpwi cr0, r2, 0 > beq cr0, LBB1_9 ;no_exit > LBB1_7: ;no_exit > mr r2, r6 > LBB1_8: ;no_exit > cmpwi cr0, r5, 0 > add r2, r2, r3 > bgt cr0, LBB1_5 ;no_exit.no_exit_llvm_crit_edge > LBB1_9: ;no_exit > mr r2, r6 > b LBB1_8 ;no_exit > LBB1_4: ;no_exit.loopexit_llvm_crit_edge &g...

> If you don't want critical edges in the machine code CFG, you're going to > have to write a machine code CFG critical edge splitting pass: LLVM > doesn't currently have one. > > -Chris Hey guys, I've coded a pass to break the critical edges of the machine control flow graph. The program works fine, but I am sure it is not the right way of implementing it.

Hi all, After searching for a decent compiler backend for ages (google sometimes isn't helpful), I recently stumbled upon LLVM. Woot!! I work on bignum arithmetic (I'm a professional mathematician) and have recently decided to switch from developing GPL'd bignum code to BSD licensed code. (See http://www.mpir.org/ which I contributed to for a while - a fork of GMP). Please bear with

On Tue, 4 Jul 2006, Fernando Magno Quintao Pereira wrote: > However, it does not remove all the critical edges. I am getting a very > weird dataflow graph (even without the Break Critical edges pass). The > dataflow generated by MachineFunction::dump() for the program below is > given here: > http://compilers.cs.ucla.edu/fernando/projects/soc/images/loop_no_crit2.pdf ... > The