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This is implemented. We now generate:
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
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@ -348,46 +348,6 @@ pass.
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//===---------------------------------------------------------------------===//
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-predsimplify should transform this:
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void bad(unsigned x)
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{
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if (x > 4)
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bar(12);
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else if (x > 3)
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bar(523);
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else if (x > 2)
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bar(36);
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else if (x > 1)
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bar(65);
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else if (x > 0)
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bar(45);
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else
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bar(367);
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}
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into:
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void good(unsigned x)
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{
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if (x == 4)
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bar(523);
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else if (x == 3)
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bar(36);
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else if (x == 2)
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bar(65);
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else if (x == 1)
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bar(45);
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else if (x == 0)
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bar(367);
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else
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bar(12);
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}
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to enable further optimizations.
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//===---------------------------------------------------------------------===//
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Consider:
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typedef unsigned U32;
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