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Minor amendment to switch-lowering improvement.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107569 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2010-07-03 08:43:32 +00:00
parent b4a74c1d82
commit b482829abb
1 changed files with 10 additions and 2 deletions
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12
lib/Target/README.txt
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@ -1918,9 +1918,17 @@ a:
.LBB0_2:
ret
.LBB0_3:
xorb %al, %al
jmp foo@PLT # TAILCALL
jmp foo # TAILCALL
The movl+movl+btq+jb could be simplified to a cmpl+jne.
Or, if we wanted to be really clever, we could simplify the whole thing to
something like the following, which eliminates a branch:
xorl $1, %edi
cmpl $4, %edi
ja .LBB0_2
ret
.LBB0_2:
jmp foo # TAILCALL
//===---------------------------------------------------------------------===//