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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2010-11-22 09:45:38 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2010-11-22 09:45:38 +0000 |
| commit | ce750f03322fe29ced3aca0718424fe173f22298 (patch) | |
| tree | 19b6190877ec7040a869a2fc085811d619e9f1f3 /test/CodeGen/X86/switch-or.ll | |
| parent | b05099bf42d54838f0648569d4ae1a98dfa7da7b (diff) | |
| download | llvm-ce750f03322fe29ced3aca0718424fe173f22298.tar.gz llvm-ce750f03322fe29ced3aca0718424fe173f22298.tar.bz2 llvm-ce750f03322fe29ced3aca0718424fe173f22298.tar.xz | |
Implement the "if (X == 6 || X == 4)" -> "if ((X|2) == 6)" optimization.
This currently only catches the most basic case, a two-case switch, but can be
extended later.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119964 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/switch-or.ll')
| -rw-r--r-- | test/CodeGen/X86/switch-or.ll | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/test/CodeGen/X86/switch-or.ll b/test/CodeGen/X86/switch-or.ll new file mode 100644 index 0000000000..75832c7d30 --- /dev/null +++ b/test/CodeGen/X86/switch-or.ll @@ -0,0 +1,22 @@ +; RUN: llc -march=x86 -asm-verbose=false < %s | FileCheck %s + +; Check that merging switch cases that differ in one bit works. +; CHECK: orl $2 +; CHECK-NEXT: cmpl $6 + +define void @foo(i32 %variable) nounwind { +entry: + switch i32 %variable, label %if.end [ + i32 4, label %if.then + i32 6, label %if.then + ] + +if.then: + %call = tail call i32 (...)* @bar() nounwind + ret void + +if.end: + ret void +} + +declare i32 @bar(...) nounwind |