Commit Graph

19719 Commits

Author SHA1 Message Date
Nate Begeman
5a01481585 Make FP_TO_UINT Illegal. This allows us to generate significantly better
codegen for FP_TO_UINT by using the legalizer's SELECT variant.

Implement a codegen improvement for SELECT_CC, selecting the false node in
the MBB that feeds the phi node.  This allows us to codegen:
void foo(int *a, int b, int c) { int d = (a < b) ? 5 : 9; *a = d; }
as:
_foo:
        li r2, 5
        cmpw cr0, r4, r3
        bgt .LBB_foo_2  ; entry
.LBB_foo_1:     ; entry
        li r2, 9
.LBB_foo_2:     ; entry
        stw r2, 0(r3)
        blr

insted of:
_foo:
        li r2, 5
        li r5, 9
        cmpw cr0, r4, r3
        bgt .LBB_foo_2  ; entry
.LBB_foo_1:     ; entry
        or r2, r5, r5
.LBB_foo_2:     ; entry
        stw r2, 0(r3)
        blr


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22784 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-14 01:17:16 +00:00
Andrew Lenharth
40b37cc28d Testing a variable before it is defined doesn't work so well. It is a fairly small thing, so just let everyone build the .a file
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22783 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13 14:58:23 +00:00
Chris Lattner
27e5142309 Ooops, don't forget to clear this. The real inner loop is now:
.LBB_foo_3:     ; no_exit.1
        lfd f2, 0(r9)
        lfd f3, 8(r9)
        fmul f4, f1, f2
        fmadd f4, f0, f3, f4
        stfd f4, 8(r9)
        fmul f3, f1, f3
        fmsub f2, f0, f2, f3
        stfd f2, 0(r9)
        addi r9, r9, 16
        addi r8, r8, 1
        cmpw cr0, r8, r4
        ble .LBB_foo_3  ; no_exit.1


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22782 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13 07:42:01 +00:00
Chris Lattner
934520a747 Recursively scan scev expressions for common subexpressions. This allows us
to handle nested loops much better, for example, by being able to tell that
these two expressions:

{( 8 + ( 16 * ( 1 +  %Tmp11 +  %Tmp12)) +  %c_),+,( 16 *  %Tmp 12)}<loopentry.1>

{(( 16 * ( 1 +  %Tmp11 +  %Tmp12)) +  %c_),+,( 16 *  %Tmp12)}<loopentry.1>

Have the following common part that can be shared:
{(( 16 * ( 1 +  %Tmp11 +  %Tmp12)) +  %c_),+,( 16 *  %Tmp12)}<loopentry.1>

This allows us to codegen an important inner loop in 168.wupwise as:

.LBB_foo_4:     ; no_exit.1
        lfd f2, 16(r9)
        fmul f3, f0, f2
        fmul f2, f1, f2
        fadd f4, f3, f2
        stfd f4, 8(r9)
        fsub f2, f3, f2
        stfd f2, 16(r9)
        addi r8, r8, 1
        addi r9, r9, 16
        cmpw cr0, r8, r4
        ble .LBB_foo_4  ; no_exit.1

instead of:

.LBB_foo_3:     ; no_exit.1
        lfdx f2, r6, r9
        add r10, r6, r9
        lfd f3, 8(r10)
        fmul f4, f1, f2
        fmadd f4, f0, f3, f4
        stfd f4, 8(r10)
        fmul f3, f1, f3
        fmsub f2, f0, f2, f3
        stfdx f2, r6, r9
        addi r9, r9, 16
        addi r8, r8, 1
        cmpw cr0, r8, r4
        ble .LBB_foo_3  ; no_exit.1


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22781 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13 07:27:18 +00:00
Nate Begeman
ff66368a5f Remove an unncessary argument to SimplifySelectCC and add an additional
assert when creating a select_cc node.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22780 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13 06:14:17 +00:00
Nate Begeman
32c392a3a5 Fix the fabs regression on x86 by abstracting the select_cc optimization
out into SimplifySelectCC.  This allows both ISD::SELECT and ISD::SELECT_CC
to use the same set of simplifying folds.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22779 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13 06:00:21 +00:00
Nate Begeman
8f331325a2 Remove support for 64b PPC, it's been broken for a long time. It'll be
back once a DAG->DAG ISel exists.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22778 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13 05:59:16 +00:00
Andrew Lenharth
7ac17529d2 Fix oversized GOT problem with gcc-4 on alpha
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22777 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13 05:09:50 +00:00
Chris Lattner
0ae380a8ac Teach SplitCriticalEdge to update LoopInfo if it is alive. This fixes
a problem in LoopStrengthReduction, where it would split critical edges
then confused itself with outdated loop information.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22776 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13 01:38:43 +00:00
Chris Lattner
8385393dc8 remove dead code. The exit block list is computed on demand, thus does not
need to be updated.  This code is a relic from when it did.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22775 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-13 01:30:36 +00:00
Chris Lattner
3e27b1f5c4 implement a couple of simple shift foldings.
e.g.  (X & 7) >> 3   -> 0


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22774 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 23:54:58 +00:00
Jim Laskey
cf083e312c Fix for 2005-08-12-rlwimi-crash.ll. Make allowance for masks being shifted to
zero.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22773 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 23:52:46 +00:00
Jim Laskey
4a17addadb Added test cases to guarantee use of ORC and ANDC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22772 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 23:40:14 +00:00
Jim Laskey
847c3a976b 1. This changes handles the cases of (~x)&y and x&(~y) yielding ANDC, and
(~x)|y and x|(~y) yielding ORC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22771 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 23:38:02 +00:00
Chris Lattner
7e03c74941 testcase that crashed the ppc backend, distilled from crafty
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22770 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 23:34:03 +00:00
Chris Lattner
c60fb08f7e When splitting critical edges, make sure not to leave the new block in the
middle of the loop.  This turns a critical loop in gzip into this:

.LBB_test_1:    ; loopentry
        or r27, r28, r28
        add r28, r3, r27
        lhz r28, 3(r28)
        add r26, r4, r27
        lhz r26, 3(r26)
        cmpw cr0, r28, r26
        bne .LBB_test_8 ; loopentry.loopexit_crit_edge
.LBB_test_2:    ; shortcirc_next.0
        add r28, r3, r27
        lhz r28, 5(r28)
        add r26, r4, r27
        lhz r26, 5(r26)
        cmpw cr0, r28, r26
        bne .LBB_test_7 ; shortcirc_next.0.loopexit_crit_edge
.LBB_test_3:    ; shortcirc_next.1
        add r28, r3, r27
        lhz r28, 7(r28)
        add r26, r4, r27
        lhz r26, 7(r26)
        cmpw cr0, r28, r26
        bne .LBB_test_6 ; shortcirc_next.1.loopexit_crit_edge
.LBB_test_4:    ; shortcirc_next.2
        add r28, r3, r27
        lhz r26, 9(r28)
        add r28, r4, r27
        lhz r25, 9(r28)
        addi r28, r27, 8
        cmpw cr7, r26, r25
        mfcr r26, 1
        rlwinm r26, r26, 31, 31, 31
        add r25, r8, r27
        cmpw cr7, r25, r7
        mfcr r25, 1
        rlwinm r25, r25, 29, 31, 31
        and. r26, r26, r25
        bne .LBB_test_1 ; loopentry

instead of this:

.LBB_test_1:    ; loopentry
        or r27, r28, r28
        add r28, r3, r27
        lhz r28, 3(r28)
        add r26, r4, r27
        lhz r26, 3(r26)
        cmpw cr0, r28, r26
        beq .LBB_test_3 ; shortcirc_next.0
.LBB_test_2:    ; loopentry.loopexit_crit_edge
        add r2, r30, r27
        add r8, r29, r27
        b .LBB_test_9   ; loopexit
.LBB_test_3:    ; shortcirc_next.0
        add r28, r3, r27
        lhz r28, 5(r28)
        add r26, r4, r27
        lhz r26, 5(r26)
        cmpw cr0, r28, r26
        beq .LBB_test_5 ; shortcirc_next.1
.LBB_test_4:    ; shortcirc_next.0.loopexit_crit_edge
        add r2, r11, r27
        add r8, r12, r27
        b .LBB_test_9   ; loopexit
.LBB_test_5:    ; shortcirc_next.1
        add r28, r3, r27
        lhz r28, 7(r28)
        add r26, r4, r27
        lhz r26, 7(r26)
        cmpw cr0, r28, r26
        beq .LBB_test_7 ; shortcirc_next.2
.LBB_test_6:    ; shortcirc_next.1.loopexit_crit_edge
        add r2, r9, r27
        add r8, r10, r27
        b .LBB_test_9   ; loopexit
.LBB_test_7:    ; shortcirc_next.2
        add r28, r3, r27
        lhz r26, 9(r28)
        add r28, r4, r27
        lhz r25, 9(r28)
        addi r28, r27, 8
        cmpw cr7, r26, r25
        mfcr r26, 1
        rlwinm r26, r26, 31, 31, 31
        add r25, r8, r27
        cmpw cr7, r25, r7
        mfcr r25, 1
        rlwinm r25, r25, 29, 31, 31
        and. r26, r26, r25
        bne .LBB_test_1 ; loopentry

Next up, improve the code for the loop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22769 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 22:22:17 +00:00
Chris Lattner
6a13aed525 Add a helper method
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22768 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 22:14:06 +00:00
Chris Lattner
07216eabb7 add a helper method
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22767 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 22:13:27 +00:00
Chris Lattner
e0391beda8 Fix a FIXME: if we are inserting code for a PHI argument, split the critical
edge so that the code is not always executed for both operands.  This
prevents LSR from inserting code into loops whose exit blocks contain
PHI uses of IV expressions (which are outside of loops).  On gzip, for
example, we turn this ugly code:

.LBB_test_1:    ; loopentry
        add r27, r3, r28
        lhz r27, 3(r27)
        add r26, r4, r28
        lhz r26, 3(r26)
        add r25, r30, r28    ;; Only live if exiting the loop
        add r24, r29, r28    ;; Only live if exiting the loop
        cmpw cr0, r27, r26
        bne .LBB_test_5 ; loopexit

into this:

.LBB_test_1:    ; loopentry
        or r27, r28, r28
        add r28, r3, r27
        lhz r28, 3(r28)
        add r26, r4, r27
        lhz r26, 3(r26)
        cmpw cr0, r28, r26
        beq .LBB_test_3 ; shortcirc_next.0
.LBB_test_2:    ; loopentry.loopexit_crit_edge
        add r2, r30, r27
        add r8, r29, r27
        b .LBB_test_9   ; loopexit
.LBB_test_2:    ; shortcirc_next.0
        ...
        blt .LBB_test_1


into this:

.LBB_test_1:    ; loopentry
        or r27, r28, r28
        add r28, r3, r27
        lhz r28, 3(r28)
        add r26, r4, r27
        lhz r26, 3(r26)
        cmpw cr0, r28, r26
        beq .LBB_test_3 ; shortcirc_next.0
.LBB_test_2:    ; loopentry.loopexit_crit_edge
        add r2, r30, r27
        add r8, r29, r27
        b .LBB_t_3:    ; shortcirc_next.0
.LBB_test_3:    ; shortcirc_next.0
        ...
        blt .LBB_test_1


Next step: get the block out of the loop so that the loop is all
fall-throughs again.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22766 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 22:06:11 +00:00
Chris Lattner
b01bfd49c3 Change break critical edges to not remove, then insert, PHI node entries.
Instead, just update the BB in-place.  This is both faster, and it prevents
split-critical-edges from shuffling the PHI argument list unneccesarily.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22765 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 21:58:07 +00:00
Andrew Lenharth
1f3e808ebf match gcc's use of tabs, makes diffs easier
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22764 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 16:14:08 +00:00
Andrew Lenharth
21e786bdb4 .section cleanup, patch from Nicholas Riley
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22763 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-12 16:13:43 +00:00
Chris Lattner
9656e721e9 First rev of Xcode 2.1 project
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22762 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-11 22:19:26 +00:00
Jim Laskey
191cf943e6 1. Added the function isOpcWithIntImmediate to simplify testing of operand with
specified opcode and an integer constant right operand.

2. Modified ISD::SHL, ISD::SRL, ISD::SRA to use rlwinm when applied after a mask.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22761 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-11 21:59:23 +00:00
Chris Lattner
2b48bc6f95 Tidied up the use of dyn_cast<ConstantSDNode> by using isIntImmediate more.
Patch by Jim Laskey.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22760 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-11 17:56:50 +00:00
Chris Lattner
54abfc5ee4 Use a more efficient method of creating integer and float virtual registers
(avoids an extra level of indirection in MakeReg).

  defined MakeIntReg using RegMap->createVirtualRegister(PPC32::GPRCRegisterClass)
  defined MakeFPReg using RegMap->createVirtualRegister(PPC32::FPRCRegisterClass)

  s/MakeReg(MVT::i32)/MakeIntReg/
  s/MakeReg(MVT::f64)/MakeFPReg/

Patch by Jim Laskey!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22759 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-11 17:15:31 +00:00
Nate Begeman
e1fae4a3ae Add a select_cc optimization for recognizing abs(int). This speeds up an
integer MPEG encoding loop by a factor of two.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22758 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-11 02:18:13 +00:00
Nate Begeman
e5d63829fd Some SELECT_CC cleanups:
1. move assertions for node creation to getNode()
2. legalize the values returned in ExpandOp immediately
3. Move select_cc optimizations from SELECT's getNode() to SELECT_CC's,
   allowing them to be cleaned up significantly.

This paves the way to pick up additional optimizations on SELECT_CC, such
as sum-of-absolute-differences.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22757 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-11 01:12:20 +00:00
Nate Begeman
c24d484b78 Make SELECT illegal on PPC32, switch to using SELECT_CC, which more closely
reflects what the hardware is capable of.  This significantly simplifies
the CC handling logic throughout the ISel.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22756 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 20:52:09 +00:00
Nate Begeman
9373a81e53 Add new node, SELECT_CC. This node is for targets that don't natively
implement SELECT.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22755 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 20:51:12 +00:00
Chris Lattner
b4138c475e Changes for PPC32ISelPattern.cpp
1. Clean up how SelectIntImmediateExpr handles use counts.
2. "Subtract from" was not clearing hi 16 bits.

Patch by Jim Laskey


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22754 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 18:11:33 +00:00
Chris Lattner
7c6e452d44 Fix an oversight that may be causing PR617.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22753 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 17:37:53 +00:00
Chris Lattner
6d92526fe1 now that we handle non-constant strides, this testcase passes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22752 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 17:17:45 +00:00
Chris Lattner
98599ba6c6 remove some trickiness that broke yacr2 and some other programs last night
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22751 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 17:15:20 +00:00
Chris Lattner
df706e3f0c Changed the XOR case to use the isOprNot predicate.
Patch by Jim Laskey!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22750 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 16:35:46 +00:00
Chris Lattner
0d7d99fd44 1. Refactored handling of integer immediate values for add, or, xor and sub.
New routine: ISel::SelectIntImmediateExpr
  2. Now checking use counts of large constants.  If use count is > 2 then drop
  thru so that the constant gets loaded into a register.
  Source:

int %test1(int %a) {
entry:
       %tmp.1 = add int %a,      123456789      ; <int> [#uses=1]
       %tmp.2 = or  int %tmp.1,  123456789      ; <int> [#uses=1]
       %tmp.3 = xor int %tmp.2,  123456789      ; <int> [#uses=1]
       %tmp.4 = sub int %tmp.3, -123456789      ; <int> [#uses=1]
       ret int %tmp.4
}

Did Emit:

       .machine ppc970


       .text
       .align  2
       .globl  _test1
_test1:
.LBB_test1_0:   ; entry
       addi r2, r3, -13035
       addis r2, r2, 1884
       ori r2, r2, 52501
       oris r2, r2, 1883
       xori r2, r2, 52501
       xoris r2, r2, 1883
       addi r2, r2, 52501
       addis r3, r2, 1883
       blr


Now Emits:

       .machine ppc970


       .text
       .align  2
       .globl  _test1
_test1:
.LBB_test1_0:   ; entry
       lis r2, 1883
       ori r2, r2, 52501
       add r3, r3, r2
       or r3, r3, r2
       xor r3, r3, r2
       add r3, r3, r2
       blr

Patch by Jim Laskey!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22749 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 16:34:52 +00:00
Duraid Madina
d2ff5ef654 sorry!! this is temporary; for some reason the nasty constmul code seems to
be an infinite loop when using g++-4.0.1*, this kills the ia64 nightly
tester. A proper fix shall be forthcoming!!! thanks for not killing me. :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22748 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 12:38:57 +00:00
Chris Lattner
979a21e766 Fix a bug compiling: select (i32 < i32), f32, f32
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22747 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 03:40:09 +00:00
Chris Lattner
94f4032448 Make loop-simplify produce better loops by turning PHI nodes like X = phi [X, Y]
into just Y.  This often occurs when it seperates loops that have collapsed loop
headers.  This implements LoopSimplify/phi-node-simplify.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22746 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 02:07:32 +00:00
Chris Lattner
8d56cdd0d1 New testcase
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22745 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 02:06:35 +00:00
Chris Lattner
cda9ca5a4f Allow indvar simplify to canonicalize ANY affine IV, not just affine IVs with
constant stride.  This implements Transforms/IndVarsSimplify/variable-stride-ivs.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22744 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 01:12:06 +00:00
Chris Lattner
a12489e34f new testcase
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22743 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 01:11:24 +00:00
Chris Lattner
05bd374b1f Fix an obvious oops
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22742 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 00:59:40 +00:00
Chris Lattner
138268160a new testcase we handle
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22741 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 00:48:11 +00:00
Chris Lattner
50fad70279 Teach LSR to strength reduce IVs that have a loop-invariant but non-constant stride.
For code like this:

void foo(float *a, float *b, int n, int stride_a, int stride_b) {
  int i;
  for (i=0; i<n; i++)
      a[i*stride_a] = b[i*stride_b];
}

we now emit:

.LBB_foo2_2:    ; no_exit
        lfs f0, 0(r4)
        stfs f0, 0(r3)
        addi r7, r7, 1
        add r4, r2, r4
        add r3, r6, r3
        cmpw cr0, r7, r5
        blt .LBB_foo2_2 ; no_exit

instead of:

.LBB_foo_2:     ; no_exit
        mullw r8, r2, r7     ;; multiply!
        slwi r8, r8, 2
        lfsx f0, r4, r8
        mullw r8, r2, r6     ;; multiply!
        slwi r8, r8, 2
        stfsx f0, r3, r8
        addi r2, r2, 1
        cmpw cr0, r2, r5
        blt .LBB_foo_2  ; no_exit

loops with variable strides occur pretty often.  For example, in SPECFP2K
there are 317 variable strides in 177.mesa, 3 in 179.art, 14 in 188.ammp,
56 in 168.wupwise, 36 in 172.mgrid.

Now we can allow indvars to turn functions written like this:

void foo2(float *a, float *b, int n, int stride_a, int stride_b) {
  int i, ai = 0, bi = 0;
  for (i=0; i<n; i++)
    {
      a[ai] = b[bi];
      ai += stride_a;
      bi += stride_b;
    }
}

into code like the above for better analysis.  With this patch, they generate
identical code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22740 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 00:45:21 +00:00
Chris Lattner
c41e34520a Fix Regression/Transforms/LoopStrengthReduce/phi_node_update_multiple_preds.ll
by being more careful about updating PHI nodes


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22739 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 00:35:32 +00:00
Chris Lattner
3b7fd6647d new testcase
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22738 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-10 00:33:01 +00:00
Chris Lattner
87265abffc Fix some 80 column violations.
Once we compute the evolution for a GEP, tell SE about it.  This allows users
of the GEP to know it, if the users are not direct.  This allows us to compile
this testcase:

void fbSolidFillmmx(int w, unsigned char *d) {
    while (w >= 64) {
        *(unsigned long long *) (d +  0) = 0;
        *(unsigned long long *) (d +  8) = 0;
        *(unsigned long long *) (d + 16) = 0;
        *(unsigned long long *) (d + 24) = 0;
        *(unsigned long long *) (d + 32) = 0;
        *(unsigned long long *) (d + 40) = 0;
        *(unsigned long long *) (d + 48) = 0;
        *(unsigned long long *) (d + 56) = 0;
        w -= 64;
        d += 64;
    }
}

into:

.LBB_fbSolidFillmmx_2:  ; no_exit
        li r2, 0
        stw r2, 0(r4)
        stw r2, 4(r4)
        stw r2, 8(r4)
        stw r2, 12(r4)
        stw r2, 16(r4)
        stw r2, 20(r4)
        stw r2, 24(r4)
        stw r2, 28(r4)
        stw r2, 32(r4)
        stw r2, 36(r4)
        stw r2, 40(r4)
        stw r2, 44(r4)
        stw r2, 48(r4)
        stw r2, 52(r4)
        stw r2, 56(r4)
        stw r2, 60(r4)
        addi r4, r4, 64
        addi r3, r3, -64
        cmpwi cr0, r3, 63
        bgt .LBB_fbSolidFillmmx_2       ; no_exit

instead of:

.LBB_fbSolidFillmmx_2:  ; no_exit
        li r11, 0
        stw r11, 0(r4)
        stw r11, 4(r4)
        stwx r11, r10, r4
        add r12, r10, r4
        stw r11, 4(r12)
        stwx r11, r9, r4
        add r12, r9, r4
        stw r11, 4(r12)
        stwx r11, r8, r4
        add r12, r8, r4
        stw r11, 4(r12)
        stwx r11, r7, r4
        add r12, r7, r4
        stw r11, 4(r12)
        stwx r11, r6, r4
        add r12, r6, r4
        stw r11, 4(r12)
        stwx r11, r5, r4
        add r12, r5, r4
        stw r11, 4(r12)
        stwx r11, r2, r4
        add r12, r2, r4
        stw r11, 4(r12)
        addi r4, r4, 64
        addi r3, r3, -64
        cmpwi cr0, r3, 63
        bgt .LBB_fbSolidFillmmx_2       ; no_exit


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22737 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-09 23:39:36 +00:00
Chris Lattner
a0740fbcc7 implement two helper methods
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22736 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-09 23:36:33 +00:00
Chris Lattner
27631a30eb add two helper methods
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22735 91177308-0d34-0410-b5e6-96231b3b80d8
2005-08-09 23:36:18 +00:00