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eea864472d
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Author SHA1 Message Date
Chris Lattner
eea864472d Implement simple promotion for cast elimination in instcombine. This is 
currently very limited, but can be extended in the future.  For example,
we now compile:

uint %test30(uint %c1) {
        %c2 = cast uint %c1 to ubyte
        %c3 = xor ubyte %c2, 1
        %c4 = cast ubyte %c3 to uint
        ret uint %c4
}

to:

_xor:
        movzbl 4(%esp), %eax
        xorl $1, %eax
        ret

instead of:

_xor:
        movb $1, %al
        xorb 4(%esp), %al
        movzbl %al, %eax
        ret

More impressively, we now compile:

struct B { unsigned bit : 1; };
void xor(struct B *b) { b->bit = b->bit ^ 1; }

To (X86/PPC):

_xor:
        movl 4(%esp), %eax
        xorl $-2147483648, (%eax)
        ret
_xor:
        lwz r2, 0(r3)
        xoris r2, r2, 32768
        stw r2, 0(r3)
        blr

instead of (X86/PPC):

_xor:
        movl 4(%esp), %eax
        movl (%eax), %ecx
        movl %ecx, %edx
        shrl $31, %edx
        # TRUNCATE movb %dl, %dl
        xorb $1, %dl
        movzbl %dl, %edx
        andl $2147483647, %ecx
        shll $31, %edx
        orl %ecx, %edx
        movl %edx, (%eax)
        ret

_xor:
        lwz r2, 0(r3)
        srwi r4, r2, 31
        xori r4, r4, 1
        rlwimi r2, r4, 31, 0, 0
        stw r2, 0(r3)
        blr

This implements InstCombine/cast.ll:test30.

llvm-svn: 28273
 2006-05-13 02:06:03 +00:00
Chris Lattner
5f2a11f1bf New testcase for instcombine 
llvm-svn: 28272
 2006-05-13 02:00:07 +00:00
Chris Lattner
4bbc1d8e95 Remove some dead variables. 
Fix a nasty bug in the memcmp optimizer where we used the wrong variable!

llvm-svn: 28269
 2006-05-12 23:35:26 +00:00
Chris Lattner
08efc01479 Remove dead stuff 
llvm-svn: 28268
 2006-05-12 23:32:01 +00:00
Chris Lattner
50371a3046 Fix build breakage :( 
llvm-svn: 28267
 2006-05-12 23:26:11 +00:00
Chris Lattner
dbbbabb17b More coverity fixes 
llvm-svn: 28266
 2006-05-12 21:14:20 +00:00
Chris Lattner
db8caed257 Dead variable 
llvm-svn: 28265
 2006-05-12 21:12:22 +00:00
Chris Lattner
adcb0582d8 Remove dead var, fix bad override. 
llvm-svn: 28264
 2006-05-12 21:09:57 +00:00
Reid Spencer
1a7e67d221 Don't use old-style casts. This prevents compiler warnings when CommandLine.h 
is used in projects that have stricter warning control than LLVM. This also
helps us find casts more easily if we ever need to.

llvm-svn: 28263
 2006-05-12 19:20:55 +00:00
Evan Cheng
772647518f If the register allocator cannot find a register to spill, try the aliases. If 
that still fails (because all the register spill weights are inf), just grab
one.

llvm-svn: 28262
 2006-05-12 19:07:46 +00:00
Evan Cheng
871a83d4d0 Remove dead code 
llvm-svn: 28261
 2006-05-12 19:03:56 +00:00
Chris Lattner
e020b812f3 Fix accidentally committed patch. 
llvm-svn: 28260
 2006-05-12 18:20:39 +00:00
Chris Lattner
04a8ddfd68 Actually override the right method. :) 
Bug identified by coverity.

llvm-svn: 28259
 2006-05-12 18:19:25 +00:00
Chris Lattner
f741502e85 remove dead variable. 
llvm-svn: 28258
 2006-05-12 18:17:25 +00:00
Chris Lattner
acd1bbfff7 Fix iterator invalidation bug, identified by Coverity. 
llvm-svn: 28257
 2006-05-12 18:13:11 +00:00
Chris Lattner
b1ad13a4bc Fix a hypothetical memory leak, identified by Coverity. In practice, this 
object is never deleted though.

llvm-svn: 28256
 2006-05-12 18:10:12 +00:00
Chris Lattner
9e29384a4b Remove dead vars 
llvm-svn: 28255
 2006-05-12 18:06:45 +00:00
Chris Lattner
9a24639afc remove dead vars 
llvm-svn: 28254
 2006-05-12 18:04:28 +00:00
Chris Lattner
11064741d3 Remove dead variable 
llvm-svn: 28253
 2006-05-12 18:02:04 +00:00
Chris Lattner
474e1b7ef3 Comment out dead variables 
llvm-svn: 28252
 2006-05-12 17:57:54 +00:00
Reid Spencer
ea509eb3ac When reading the symbol table, make sure to delete the ArchiveMember 
created by reading the symbol table.

llvm-svn: 28251
 2006-05-12 17:56:20 +00:00
Chris Lattner
90527550c1 Remove dead var 
llvm-svn: 28250
 2006-05-12 17:50:35 +00:00
Chris Lattner
9930cf948e Remove dead variable 
llvm-svn: 28249
 2006-05-12 17:41:45 +00:00
Chris Lattner
9789688d36 remove dead variable. 
llvm-svn: 28248
 2006-05-12 17:33:59 +00:00
Chris Lattner
2c316c91e8 Remove dead variable. 
llvm-svn: 28247
 2006-05-12 17:31:21 +00:00
Chris Lattner
34893c34e5 Avoid defining dead result 
llvm-svn: 28246
 2006-05-12 17:29:40 +00:00
Chris Lattner
60dfdded64 Remove dead return value. 
llvm-svn: 28245
 2006-05-12 17:28:36 +00:00
Chris Lattner
db5b91f6a8 Compile: 
%tmp152 = setgt uint %tmp144, %tmp149           ; <bool> [#uses=1]
        %tmp159 = setlt uint %tmp144, %tmp149           ; <bool> [#uses=1]
        %bothcond2 = or bool %tmp152, %tmp159           ; <bool> [#uses=1]

To setne, not setune, which causes an assertion fault.

llvm-svn: 28244
 2006-05-12 17:03:46 +00:00
Chris Lattner
bcd2c4f32d Fix PowerPC/2006-05-12-rlwimi-crash.ll 
Nate, please verify that if InsertMask is 0, rlwimi shouldn't be used.
This fixes the crash and causes no PPC testsuite regressions.

llvm-svn: 28243
 2006-05-12 16:29:37 +00:00
Chris Lattner
436447489d new testcase for a recent rlwimi crash. 
llvm-svn: 28242
 2006-05-12 16:28:13 +00:00
Evan Cheng
409dd126bf Noop instruction 
llvm-svn: 28241
 2006-05-12 07:47:00 +00:00
Evan Cheng
3d1e1ffd9b Unused instruction 
llvm-svn: 28240
 2006-05-12 07:42:01 +00:00
Owen Anderson
1245bd420e Add a method to generate a string representation from a TargetData. 
This continues the work on PR 761.

llvm-svn: 28239
 2006-05-12 07:01:44 +00:00
Owen Anderson
29e4d70aed Refactor a bunch of includes so that TargetMachine.h doesn't have to include 
TargetData.h.  This should make recompiles a bit faster with my current
TargetData tinkering.

llvm-svn: 28238
 2006-05-12 06:33:49 +00:00
Owen Anderson
a0a9e4584a Fix some tabbing issues. 
llvm-svn: 28237
 2006-05-12 06:06:55 +00:00
Evan Cheng
f3d7bb7a9e Backing out fix for PR770. Need to re-apply it after live range splitting is possible 
llvm-svn: 28236
 2006-05-12 06:06:34 +00:00
Evan Cheng
c24d0f281c Duh. That could take a long time. 
llvm-svn: 28235
 2006-05-12 06:05:18 +00:00
Owen Anderson
30ffff31f2 Add a new constructor to TargetData that builds a TargetData from its 
string representation.

This is part of PR 761.

llvm-svn: 28234
 2006-05-12 05:49:47 +00:00
Chris Lattner
a500852895 Two simplifications for token factor nodes: simplify tf(x,x) -> x. 
simplify tf(x,y,y,z) -> tf(x,y,z).

llvm-svn: 28233
 2006-05-12 05:01:37 +00:00
Evan Cheng
787496ebcd New scheduling test case. 
llvm-svn: 28232
 2006-05-12 01:59:17 +00:00
Evan Cheng
0b8e4bca80 Add capability to scheduler to commute nodes for profit. 
If a two-address code whose first operand has uses below, it should be commuted
when possible.

llvm-svn: 28230
 2006-05-12 01:58:24 +00:00
Evan Cheng
eb67c0f664 Typo! How did we commute nodes before?! 
llvm-svn: 28229
 2006-05-12 01:46:26 +00:00
Chris Lattner
14cdcc59b8 For extra sanity checking, fill free'd memory with garbage so we know that 
people aren't reusing machine code buffers at all.

llvm-svn: 28228
 2006-05-12 00:03:12 +00:00
Chris Lattner
ecc6d6f334 Fix some bugs in the freelist manipulation code. 
Finally, implement ExecutionEngine::freeMachineCodeForFunction.

llvm-svn: 28227
 2006-05-11 23:56:57 +00:00
Evan Cheng
cb2a0f392c Refactor scheduler code. Move register-reduction list scheduler to a 
separate file. Added an initial implementation of top-down register pressure
reduction list scheduler.

llvm-svn: 28226
 2006-05-11 23:55:42 +00:00
Chris Lattner
81a3c90080 Significantly revamp allocation of machine code to use free lists, real 
allocation policies and much more.  All this complexity, and we have no
functionality change, woo! :)

llvm-svn: 28225
 2006-05-11 23:08:08 +00:00
Chris Lattner
3fad520c62 Refactor some code, making it simpler. 
When doing the initial pass of constant folding, if we get a constantexpr,
simplify the constant expr like we would do if the constant is folded in the
normal loop.

This fixes the missed-optimization regression in
Transforms/InstCombine/getelementptr.ll last night.

llvm-svn: 28224
 2006-05-11 17:11:52 +00:00
Evan Cheng
6a08dd641a Add MOV16_rm / MOV32_rm and MOV16_mr / MOV32_mr to isLoadFromStackSlot and isStoreToStackSlot 
llvm-svn: 28223
 2006-05-11 07:33:49 +00:00
Evan Cheng
e2cebf972d Also add super- register class info. 
llvm-svn: 28222
 2006-05-11 07:31:44 +00:00
Evan Cheng
d6549daf76 Also add super- register classes info. 
llvm-svn: 28221
 2006-05-11 07:30:26 +00:00