diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/README.txt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/README.txt b/llvm/lib/Target/X86/README.txt index 6c9a235ebbb..c85477c1a68 100644 --- a/llvm/lib/Target/X86/README.txt +++ b/llvm/lib/Target/X86/README.txt @@ -517,3 +517,19 @@ It would be better to emit "cmp %al, 1" than a xor and test. //===---------------------------------------------------------------------===// Enable X86InstrInfo::convertToThreeAddress(). + +//===---------------------------------------------------------------------===// + +Investigate whether it is better to codegen the following + + %tmp.1 = mul int %x, 9 +to + + movl 4(%esp), %eax + leal (%eax,%eax,8), %eax + +as opposed to what llc is currently generating: + + imull $9, 4(%esp), %eax + +Currently the load folding imull has a higher complexity than the LEA32 pattern. |
