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36f891bdf6
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870 Commits

Author SHA1 Message Date
Nate Begeman
36f891bdf6 Break SCEVExpander out of IndVarSimplify into its own .h/.cpp file so that 
other passes may use it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22557 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-07-30 00:12:19 +00:00
Jeff Cohen
00b16889ab Eliminate all remaining tabs and trailing spaces. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22523 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-07-27 06:12:32 +00:00
Chris Lattner
f9944f109c Do not let MaskedValueIsZero consider undef to be zero, for reasons 
explained in the comment.

This fixes UnitTests/2003-09-18-BitFieldTest on darwin


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22483 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-07-20 18:49:28 +00:00
Chris Lattner
7911f03626 When transforming &A[i] < &A[j] -> i < j, make sure to perform the comparison 
as a signed compare.  This patch may fix PR597, but is correct in any case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22465 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-07-18 23:07:33 +00:00
Chris Lattner
b3d59701c8 Fix a problem that instcombine would hit when dealing with unreachable code. 
Because the instcombine has to scan the entire function when it starts up
to begin with, we might as well do it in DFO so we can nuke unreachable code.

This fixes: Transforms/InstCombine/2005-07-07-DeadPHILoop.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22348 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-07-07 20:40:38 +00:00
Andrew Lenharth
38b5807bd9 prevent va_arg from being hoisted from a loop 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22265 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-20 13:36:33 +00:00
Andrew Lenharth
558bc88a00 core changes for varargs 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22254 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-18 18:34:52 +00:00
Reid Spencer
4b828e6384 Clean up some uninitialized variables and missing return statements that 
GCC 4.0.0 compiler (sometimes incorrectly) warns about under release build.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22249 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-18 17:37:34 +00:00
Chris Lattner
e88b7533be This is not true: (X != 13 | X < 15) -> X < 15 
It is actually always true.  This fixes PR586 and
Transforms/InstCombine/2005-06-16-SetCCOrSetCCMiscompile.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22236 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-17 03:59:17 +00:00
Chris Lattner
5662503afd Don't crash when dealing with INTMIN. This fixes PR585 and 
Transforms/InstCombine/2005-06-16-RangeCrash.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22234 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-17 02:05:55 +00:00
Chris Lattner
d7e31cfaae avoid constructing out of range shift amounts. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22230 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-17 01:29:28 +00:00
Chris Lattner
f9c775c22e Fix PR583 and testcase Transforms/InstCombine/2005-06-15-DivSelectCrash.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22227 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-16 04:55:52 +00:00
Chris Lattner
8d7089e1d5 Fix PR571, removing code that does just the WRONG thing :) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22225 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-16 03:00:08 +00:00
Chris Lattner
aa457ac2e7 Fix a bug in my previous patch. Do not get the shift amount type (which 
is always ubyte, get the type being shifted).  This unbreaks espresso


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22224 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-16 01:52:07 +00:00
Chris Lattner
4bd09d70cc Fix PR582. The rewriter can move casts around, which invalidated the 
BB iterator.  This fixes Transforms/IndVarsSimplify/2005-06-15-InstMoveCrash.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22221 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-15 21:29:31 +00:00
Chris Lattner
e17a128a55 Fix PR577 and testcase InstCombine/2005-06-15-ShiftSetCCCrash.ll. 
Do not perform undefined out of range shifts.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22217 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-15 20:53:31 +00:00
Reid Spencer
877c3e2b81 Put the hack back in that removes features, causes regressions to fail, but 
allows test programs to succeed. Actual fix for this is forthcoming.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22213 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-15 18:25:30 +00:00
Reid Spencer
16b5644f04 Unbreak several InstCombine regression checks introduced by a hack to 
fix the bzip2 test. A better hack is needed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22209 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-13 06:41:26 +00:00
Andrew Lenharth
837be1ec35 hack to fix bzip2 (bug 571) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22192 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-04 12:43:56 +00:00
Chris Lattner
e43702695d preserve calling conventions when hacking on code 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22024 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-14 12:25:32 +00:00
Chris Lattner
08b22ecc88 calling a function with the wrong CC is undefined, turn it into an unreachable 
instruction.  This is useful for catching optimizers that don't preserve
calling conventions


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21928 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-13 07:09:09 +00:00
Chris Lattner
641f02f10f Fix Reassociate/shifttest.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21839 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-10 03:39:25 +00:00
Chris Lattner
7f78f218fd If a function contains no allocas, all of the calls in it are trivially 
suitable for tail calls.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21836 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-09 23:51:13 +00:00
Chris Lattner
6e4c6495eb implement and.ll:test33 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21809 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-09 04:58:36 +00:00
Chris Lattner
44b8c7d5d3 Implement Reassociate/mul-neg-add.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21788 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 21:41:35 +00:00
Chris Lattner
6f156856ca Bail out earlier 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21786 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 21:33:47 +00:00
Chris Lattner
f33151aff0 Teach reassociate that 0-X === X*-1 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21785 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 21:28:52 +00:00
Chris Lattner
9c72319938 Fix PR557 and basictest[34].ll. 
This makes reassociate realize that loads should be treated as unmovable, and
gives distinct ranks to distinct values defined in the same basic block, allowing
reassociate to do its thing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21783 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 20:57:04 +00:00
Chris Lattner
c9fd097a01 Add debugging information 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21781 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 20:09:57 +00:00
Chris Lattner
989f6229bc eliminate gotos 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21780 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 19:48:43 +00:00
Chris Lattner
109d34d6ff Improve reassociation handling of inverses, implementing inverses.ll. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21778 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 18:59:37 +00:00
Chris Lattner
928128281f clean up and modernize this pass. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21776 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 18:45:26 +00:00
Chris Lattner
120347e8d1 Strength reduce SAR into SHR if there is no way sign bits could be shifted 
in.  This tends to get cases like this:

  X = cast ubyte to int
  Y = shr int X, ...

Tested by: shift.ll:test24


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21775 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 17:34:56 +00:00
Chris Lattner
4690010006 Refactor some code 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21772 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 00:19:31 +00:00
Chris Lattner
cc8a2b98f2 Handle some simple cases where we can see that values get annihilated. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21771 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-08 00:08:33 +00:00
Chris Lattner
f4d4c87985 Fix a miscompilation of crafty by clobbering the "A" variable. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21770 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-07 23:49:08 +00:00
Chris Lattner
c0649ac931 Rewrite the guts of the reassociate pass to be more efficient and logical. Instead 
of trying to do local reassociation tweaks at each level, only process an expression
tree once (at its root).  This does not improve the reassociation pass in any real way.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21768 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-07 21:59:39 +00:00
Chris Lattner
0975ed5f4e Convert shifts to muls to assist reassociation. This implements 
Reassociate/shifttest.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21761 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-07 04:24:13 +00:00
Chris Lattner
08b43921e1 Simplify the code and rearrange it. No major functionality changes here. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21759 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-07 04:08:02 +00:00
Chris Lattner
a9e9211bbb Preserve tail marker 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21737 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-06 06:48:21 +00:00
Chris Lattner
eabfa4787a Teach instcombine propagate zeroness through shl instructions, implementing 
and.ll:test31


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21717 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-06 04:53:20 +00:00
Chris Lattner
d7115b01a0 Implement shift.ll:test23. If we are shifting right then immediately truncating 
the result, turn signed shift rights into unsigned shift rights if possible.

This leads to later simplification and happens *often* in 176.gcc.  For example,
this testcase:

struct xxx { unsigned int code : 8; };
enum codes { A, B, C, D, E, F };
int foo(struct xxx *P) {
  if ((enum codes)P->code == A)
     bar();
}

used to be compiled to:

int %foo(%struct.xxx* %P) {
        %tmp.1 = getelementptr %struct.xxx* %P, int 0, uint 0           ; <uint*> [#uses=1]
        %tmp.2 = load uint* %tmp.1              ; <uint> [#uses=1]
        %tmp.3 = cast uint %tmp.2 to int                ; <int> [#uses=1]
        %tmp.4 = shl int %tmp.3, ubyte 24               ; <int> [#uses=1]
        %tmp.5 = shr int %tmp.4, ubyte 24               ; <int> [#uses=1]
        %tmp.6 = cast int %tmp.5 to sbyte               ; <sbyte> [#uses=1]
        %tmp.8 = seteq sbyte %tmp.6, 0          ; <bool> [#uses=1]
        br bool %tmp.8, label %then, label %UnifiedReturnBlock

Now it is compiled to:

        %tmp.1 = getelementptr %struct.xxx* %P, int 0, uint 0           ; <uint*> [#uses=1]
        %tmp.2 = load uint* %tmp.1              ; <uint> [#uses=1]
        %tmp.2 = cast uint %tmp.2 to sbyte              ; <sbyte> [#uses=1]
        %tmp.8 = seteq sbyte %tmp.2, 0          ; <bool> [#uses=1]
        br bool %tmp.8, label %then, label %UnifiedReturnBlock

which is the difference between this:

foo:
        subl $4, %esp
        movl 8(%esp), %eax
        movl (%eax), %eax
        shll $24, %eax
        sarl $24, %eax
        testb %al, %al
        jne .LBBfoo_2

and this:

foo:
        subl $4, %esp
        movl 8(%esp), %eax
        movl (%eax), %eax
        testb %al, %al
        jne .LBBfoo_2

This occurs 3243 times total in the External tests, 215x in povray,
6x in each f2c'd program, 1451x in 176.gcc, 7x in crafty, 20x in perl,
25x in gap, 3x in m88ksim, 25x in ijpeg.

Maybe this will cause a little jump on gcc tommorow :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21715 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-06 04:18:52 +00:00
Chris Lattner
7aed7ac5e1 Implement xor.ll:test22 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21713 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-06 02:07:39 +00:00
Chris Lattner
d152380ba8 implement and.ll:test30 and set.ll:test21 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21712 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-06 01:53:19 +00:00
Chris Lattner
828eeddb38 implement or.ll:test20 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21709 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-06 00:58:50 +00:00
Chris Lattner
693787a5ec Instcombine: cast (X != 0) to int, cast (X == 1) to int -> X iff X has only the low bit set. 
This implements set.ll:test20.

This triggers 2x on povray, 9x on mesa, 11x on gcc, 2x on crafty, 1x on eon,
6x on perlbmk and 11x on m88ksim.

It allows us to compile these two functions into the same code:

struct s { unsigned int bit : 1; };
unsigned foo(struct s *p) {
  if (p->bit)
    return 1;
  else
    return 0;
}
unsigned bar(struct s *p) { return p->bit; }


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21690 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-04 19:10:26 +00:00
Chris Lattner
9fb25db11e Implement getelementptr.ll:test11 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21647 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-01 04:42:15 +00:00
Chris Lattner
37366c1ba8 Check for volatile loads only once. 
Implement load.ll:test7


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21645 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-01 04:24:53 +00:00
Chris Lattner
93b94a6ccf Fix the compile failures from last night. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21565 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-26 14:40:41 +00:00
Chris Lattner
a70b66d49e implement getelementptr.ll:test10 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21541 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-25 20:17:30 +00:00