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Mirror of https://github.com/RPCS3/llvm-mirror
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PPCInstrInfo::insertSelect and PPCInstrInfo::canInsertSelect were computing the common subclass of the true and false inputs, and then selecting either the 32-bit or the 64-bit isel variant based on the result of calling PPC::GPRCRegClass.hasSubClassEq(RC) and PPC::G8RCRegClass.hasSubClassEq(RC) (where RC is the common subclass). Unfortunately, this is not quite right: if we have something like this: %vreg8<def> = SELECT_CC_I8 %vreg4<kill>, %vreg7<kill>, %vreg6<kill>, 76; G8RC_and_G8RC_NOX0:%vreg8 CRRC:%vreg4 G8RC_NOX0:%vreg7,%vreg6 then the common subclass of G8RC_and_G8RC_NOX0 and G8RC_NOX0 is G8RC_NOX0, and G8RC_NOX0 is not a subclass of G8RC (because it also contains the ZERO8 pseudo-register). As a result, we also need to check the common subclass against GPRC_NOR0 and G8RC_NOX0 explicitly. This had not been a problem for clients of insertSelect that called canInsertSelect first (because it had a compensating mistake), but insertSelect is also used by the PPC pseudo-instruction expander, and this error was causing a problem in that context. This problem was found by csmith. llvm-svn: 186343 |
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