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int %test(ulong *%tmp) { %tmp = load ulong* %tmp ; <ulong> [#uses=1] %tmp.mask = shr ulong %tmp, ubyte 50 ; <ulong> [#uses=1] %tmp.mask = cast ulong %tmp.mask to ubyte %tmp2 = and ubyte %tmp.mask, 3 ; <ubyte> [#uses=1] %tmp2 = cast ubyte %tmp2 to int ; <int> [#uses=1] ret int %tmp2 } to: _test: movl 4(%esp), %eax movl 4(%eax), %eax shrl $18, %eax andl $3, %eax ret instead of: _test: movl 4(%esp), %eax movl 4(%eax), %eax shrl $18, %eax # TRUNCATE movb %al, %al andb $3, %al movzbl %al, %eax ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30558 91177308-0d34-0410-b5e6-96231b3b80d8 |
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