Chris Lattner
9e230fb6b2
fix incorrect folding of icmp with undef, PR6481.
...
llvm-svn: 97659
2010-03-03 19:46:03 +00:00
Chris Lattner
18e6b4eb6b
fix PR6195, a bug constant folding scalar -> vector compares.
...
llvm-svn: 94997
2010-02-01 20:04:40 +00:00
Chris Lattner
f1474e1761
enhance x-(-A) -> x+A to preserve NUW/NSW.
...
Use the presence of NSW/NUW to fold "icmp (x+cst), x" to a constant in
cases where it would otherwise be undefined behavior.
Surprisingly (to me at least), this triggers hundreds of the times in
a few benchmarks: lencode, ldecode, and 466.h264ref seem to *really*
like this.
llvm-svn: 91812
2009-12-21 04:04:05 +00:00
Chris Lattner
d34eb29977
Optimize all cases of "icmp (X+Cst), X" to something simpler. This triggers
...
a bunch in lencode, ldecod, spass, 176.gcc, 252.eon, among others. It is
also the first part of PR5822
llvm-svn: 91811
2009-12-21 03:19:28 +00:00
Chris Lattner
072f39fd3a
convert to filecheck
...
llvm-svn: 91810
2009-12-21 03:11:05 +00:00
Chris Lattner
40d1618562
simplify a transformation by making it more general.
...
llvm-svn: 83792
2009-10-11 21:22:21 +00:00
Dan Gohman
c95df8b6d8
Use opt -S instead of piping bitcode output through llvm-dis.
...
llvm-svn: 81257
2009-09-08 22:34:10 +00:00
Dan Gohman
8d84372836
Change these tests to feed the assembly files to opt directly, instead
...
of using llvm-as, now that opt supports this.
llvm-svn: 81226
2009-09-08 16:50:01 +00:00
Chris Lattner
8bb351e2c2
fix PR4837, some bugs folding vector compares. These
...
return a vector of i1, not i1 itself.
llvm-svn: 80761
2009-09-02 05:12:37 +00:00
Chris Lattner
660c094906
Implement rdar://6480391, extending of equality icmp's to avoid a truncation.
...
I noticed this in the code compiled for a routine using std::map, which produced
this code:
%25 = tail call i32 @memcmp(i8* %24, i8* %23, i32 6) nounwind readonly
%.lobit.i = lshr i32 %25, 31 ; <i32> [#uses=1]
%tmp.i = trunc i32 %.lobit.i to i8 ; <i8> [#uses=1]
%toBool = icmp eq i8 %tmp.i, 0 ; <i1> [#uses=1]
br i1 %toBool, label %bb3, label %bb4
which compiled to:
call L_memcmp$stub
shrl $31, %eax
testb %al, %al
jne LBB1_11 ##
with this change, we compile it to:
call L_memcmp$stub
testl %eax, %eax
js LBB1_11
This triggers all the time in common code, with patters like this:
%169 = and i32 %ply, 1 ; <i32> [#uses=1]
%170 = trunc i32 %169 to i8 ; <i8> [#uses=1]
%toBool = icmp ne i8 %170, 0 ; <i1> [#uses=1]
%7 = lshr i32 %6, 24 ; <i32> [#uses=1]
%9 = trunc i32 %7 to i8 ; <i8> [#uses=1]
%10 = icmp ne i8 %9, 0 ; <i1> [#uses=1]
etc
llvm-svn: 61985
2009-01-09 07:47:06 +00:00
Reid Spencer
c49d7dd886
For PR1319:
...
Upgrade tests to work with new llvm.exp version of llvm_runtest.
llvm-svn: 36013
2007-04-14 20:13:02 +00:00
Chris Lattner
0a1e870a6b
sext of compares.
...
llvm-svn: 35892
2007-04-11 06:57:54 +00:00
Chris Lattner
3ea6010b67
new testcase
...
llvm-svn: 35889
2007-04-11 06:52:24 +00:00
