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author | Chris Lattner <sabre@nondot.org> | 2011-01-24 01:12:18 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2011-01-24 01:12:18 +0000 |
commit | 7ea7d32de64247e1432a3d8b8d7bd4515714e63e (patch) | |
tree | 5d0632bb5e51fe541283b000b690c14bf6d4fb31 /lib/Target/README.txt | |
parent | e3357863aaabe297c5fa819d083f2308ebb5f2c2 (diff) | |
download | llvm-7ea7d32de64247e1432a3d8b8d7bd4515714e63e.tar.gz llvm-7ea7d32de64247e1432a3d8b8d7bd4515714e63e.tar.bz2 llvm-7ea7d32de64247e1432a3d8b8d7bd4515714e63e.tar.xz |
with recent work, we now optimize this into:
define i32 @foo(i32 %x) nounwind readnone ssp {
entry:
%tobool = icmp eq i32 %x, 0
%tmp5 = select i1 %tobool, i32 2, i32 1
ret i32 %tmp5
}
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124091 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/README.txt')
-rw-r--r-- | lib/Target/README.txt | 20 |
1 files changed, 0 insertions, 20 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index ea9bc8d84c..153c7d9068 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -1270,26 +1270,6 @@ SingleSource/Benchmarks/Misc/dt.c //===---------------------------------------------------------------------===// -A/B get pinned to the stack because we turn an if/then into a select instead -of PRE'ing the load/store. This may be fixable in instcombine: -http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37892 - -struct X { int i; }; -int foo (int x) { - struct X a; - struct X b; - struct X *p; - a.i = 1; - b.i = 2; - if (x) - p = &a; - else - p = &b; - return p->i; -} - -//===---------------------------------------------------------------------===// - Interesting missed case because of control flow flattening (should be 2 loads): http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26629 With: llvm-gcc t2.c -S -o - -O0 -emit-llvm | llvm-as | |