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llvm-6502/test/CodeGen/X86/switch-or.ll
Benjamin Kramer ce750f0332 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
2010-11-22 09:45:38 +00:00

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LLVM

; 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