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with recent work, we now optimize this into:

Browse Source 
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
This commit is contained in:
Chris Lattner 2011-01-24 01:12:18 +00:00
parent e3357863aa
commit 7ea7d32de6
1 changed files with 0 additions and 20 deletions
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20
lib/Target/README.txt
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@ -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 |