a10e65c852
Add a test for my change to disable reassociation for i1 types.
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llvm-svn: 95465
2010-02-06 01:16:25 +00:00
0c59ac3f41
When factoring multiply expressions across adds, factor both
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positive and negative forms of constants together. This
allows us to compile:
int foo(int x, int y) {
return (x-y) + (x-y) + (x-y);
}
into:
_foo: ## @foo
subl %esi, %edi
leal (%rdi,%rdi,2), %eax
ret
instead of (where the 3 and -3 were not factored):
_foo:
imull $-3, 8(%esp), %ecx
imull $3, 4(%esp), %eax
addl %ecx, %eax
ret
this started out as:
movl 12(%ebp), %ecx
imull $3, 8(%ebp), %eax
subl %ecx, %eax
subl %ecx, %eax
subl %ecx, %eax
ret
This comes from PR5359.
llvm-svn: 92381
2010-01-01 01:13:15 +00:00
2f03e64094
test case we alredy get right.
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llvm-svn: 92380
2010-01-01 00:50:00 +00:00
fed3397654
reuse negates where possible instead of always creating them from scratch.
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This allows us to optimize test12 into:
define i32 @test12(i32 %X) {
%factor = mul i32 %X, -3 ; <i32> [#uses=1]
%Z = add i32 %factor, 6 ; <i32> [#uses=1]
ret i32 %Z
}
instead of:
define i32 @test12(i32 %X) {
%Y = sub i32 6, %X ; <i32> [#uses=1]
%C = sub i32 %Y, %X ; <i32> [#uses=1]
%Z = sub i32 %C, %X ; <i32> [#uses=1]
ret i32 %Z
}
llvm-svn: 92373
2009-12-31 20:34:32 +00:00
60b71b5c4d
teach reassociate to factor x+x+x -> x*3. While I'm at it,
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fix RemoveDeadBinaryOp to actually do something.
llvm-svn: 92368
2009-12-31 19:24:52 +00:00
4e3a5678af
simple fix for an incorrect factoring which causes a
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miscompilation, PR5458.
llvm-svn: 92354
2009-12-31 08:33:49 +00:00
2d3b53a68c
merge some more tests in.
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llvm-svn: 92353
2009-12-31 08:32:22 +00:00
19a4baa201
filecheckize
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llvm-svn: 92352
2009-12-31 08:29:56 +00:00
1880092722
Change tests from "opt %s" to "opt < %s" so that opt doesn't see the
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input filename so that opt doesn't print the input filename in the
output so that grep lines in the tests don't unintentionally match
strings in the input filename.
llvm-svn: 81537
2009-09-11 18:01:28 +00:00
72a13d2476
Use opt -S instead of piping bitcode output through llvm-dis.
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llvm-svn: 81257
2009-09-08 22:34:10 +00:00
9737a63ed8
Change these tests to feed the assembly files to opt directly, instead
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of using llvm-as, now that opt supports this.
llvm-svn: 81226
2009-09-08 16:50:01 +00:00
0ea4c8d706
Upgrade tests to not use llvm-upgrade.
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llvm-svn: 48530
2008-03-19 04:36:04 +00:00
83b3d82672
Regression is gone, don't try to find it on clean target.
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llvm-svn: 33296
2007-01-17 07:59:14 +00:00
Bob Wilson