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This is implemented. We now generate:

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entry:
        icmp ugt i32 %x, 4              ; <i1>:0 [#uses=1]
        br i1 %0, label %cond_true, label %cond_false

cond_true:              ; preds = %entry
        %tmp1 = tail call i32 (...)* @bar( i32 12 )             ; <i32> [#uses=0]
        ret void

cond_false:             ; preds = %entry
        switch i32 %x, label %cond_true15 [
                 i32 4, label %cond_true3
                 i32 3, label %cond_true7
                 i32 2, label %cond_true11
                 i32 0, label %cond_false17
        ]

...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35142 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2007-03-18 14:37:20 +00:00
parent cf596c54d4
commit 7f4ba44f37
1 changed files with 0 additions and 40 deletions
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40
lib/Target/README.txt
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@ -348,46 +348,6 @@ pass.
//===---------------------------------------------------------------------===//
-predsimplify should transform this:
void bad(unsigned x)
{
if (x > 4)
bar(12);
else if (x > 3)
bar(523);
else if (x > 2)
bar(36);
else if (x > 1)
bar(65);
else if (x > 0)
bar(45);
else
bar(367);
}
into:
void good(unsigned x)
{
if (x == 4)
bar(523);
else if (x == 3)
bar(36);
else if (x == 2)
bar(65);
else if (x == 1)
bar(45);
else if (x == 0)
bar(367);
else
bar(12);
}
to enable further optimizations.
//===---------------------------------------------------------------------===//
Consider:
typedef unsigned U32;