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new bswap idiom
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32012 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1,4 +1,4 @@
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep 'call.*llvm.bswap' | wc -l | grep 4
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep 'call.*llvm.bswap' | wc -l | grep 5
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uint %test1(uint %i) {
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%tmp1 = shr uint %i, ubyte 24 ; <uint> [#uses=1]
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@ -40,3 +40,22 @@ ushort %test4(ushort %s) {
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ret ushort %tmp5
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}
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; unsigned short test5(unsigned short a) {
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; return ((a & 0xff00) >> 8 | (a & 0x00ff) << 8);
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;}
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ushort %test5(ushort %a) {
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%tmp = zext ushort %a to int
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%tmp1 = and int %tmp, 65280
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%tmp2 = ashr int %tmp1, ubyte 8
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%tmp2 = trunc int %tmp2 to short
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%tmp3 = zext ushort %a to int
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%tmp4 = and int %tmp3, 255
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%tmp5 = shl int %tmp4, ubyte 8
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%tmp5 = trunc int %tmp5 to short
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%tmp = or short %tmp2, %tmp5
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%tmp6 = bitcast short %tmp to ushort
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%tmp6 = zext ushort %tmp6 to int
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%retval = trunc int %tmp6 to ushort
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ret ushort %retval
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}
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