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add a missed case.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45141 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-12-18 01:19:18 +00:00
parent a5cecd0a13
commit fd2025e9db
1 changed files with 18 additions and 0 deletions
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18
lib/Target/README.txt
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@ -464,3 +464,21 @@ entry:
}
//===---------------------------------------------------------------------===//
This code is often produced by the SMAX expansion in SCEV:
define i32 @foo(i32 %a) {
entry:
%tmp15 = sub i32 99, %a ; <i32> [#uses=2]
%tmp16 = icmp slt i32 %tmp15, 0 ; <i1> [#uses=1]
%smax = select i1 %tmp16, i32 0, i32 %tmp15 ; <i32> [#uses=1]
%tmp12 = add i32 %smax, %a ; <i32> [#uses=1]
%tmp13 = add i32 %tmp12, 1 ; <i32> [#uses=1]
ret i32 %tmp13
}
Note that the tmp12 add can be pushed through the select operands, turning
it into a "select %tmp16, %a, 99". We apparently already do this in dag
combine because it isn't present in X86 output.
//===---------------------------------------------------------------------===//