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A isel deficiency.

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llvm-svn: 28427
This commit is contained in:
Evan Cheng 2006-05-22 05:54:49 +00:00
parent f628e4e774
commit c25e986c9f
1 changed files with 19 additions and 0 deletions
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19
lib/Target/X86/README.txt
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@ -586,4 +586,23 @@ as available and put it in some work list. Select other nodes in the normal
manner. The chain operands are selected after all other nodes are selected. Uses
of chain nodes are modified after instruction selection is completed.
//===---------------------------------------------------------------------===//
Another instruction selector deficiency:
void %bar() {
%tmp = load int (int)** %foo
%tmp = tail call int %tmp( int 3 )
ret void
}
_bar:
subl $12, %esp
movl L_foo$non_lazy_ptr, %eax
movl (%eax), %eax
call *%eax
addl $12, %esp
ret
The current isel scheme will not allow the load to be folded in the call since
the load's chain result is read by the callseq_start.