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authorBjörn Gustavsson <[email protected]>2015-06-25 13:21:14 +0200
committerBjörn Gustavsson <[email protected]>2015-07-03 14:34:58 +0200
commit62473daf8169a04a07409f344d938bc51a4536c3 (patch)
tree153bf43a5833103f6d368de318288aad692fcedf /prebuild.delete
parent3dc2bee53b4d36f41821a6ab512cf01c958c11f9 (diff)
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Introduce swap_temp/3 and swap/2
Sequences of three move instructionst that effectively swap the contents of two registers are fairly common. We can replace them with a swap_temp/3 instruction. The third operand is the temporary register to be used for swapping, since the temporary register may actually be used. If swap_temp/3 instruction is followed by a call, the temporary register will often (but not always) be killed by the call. If it is killed, we can replace the swap_temp/3 instruction with a slightly cheaper swap/2 instruction.
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