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...t program status register). ARM::SELECT would expand to a conditional move (moveq for example). Something similar is done by the Alpha backend: --------------------------------------------------------------------------------------------- def CMOVEQ : OForm4< 0x11, 0x24, "cmoveq $RCOND,$RTRUE,$RDEST", [(set GPRC:$RDEST, (select (seteq GPRC:$RCOND, 0), GPRC:$RTRUE, GPRC:$RFALSE))], s_cmov>; ---------------------------------------------------------------------------------------------- One thing that I don't understand is how the $RFALSE value is used. $RDEST m...

Hello. Because I experience optimizations (DCE, OoO schedule) which mess the correct semantics of the list of instructions lowered in ISelLowering from the VSELECT LLVM instruction, and these bad transformations happen even before scheduling, at later I-sel subpasses, I try to fix this problem by lowering VSELECT to only one pseudo-instruction and LATER translate it to a list of

...enum SaType { SA_NORESTORE = 0,/* = 0 */ SA_RESTORE, SA_DEFAULT,/* was === SA_RESTORE */ SA_NOSAVE, SA_SAVE, SA_SAVEASK, SA_SUICIDE }; enum RBool { RFalse = 0, RTrue }; enum RYesNoCancel { Yes = 1, No = -1, Cancel = 0 }; enum RUIMode { RGui = 0, RTerm, LinkDLL }; [StructLayout(LayoutKind.Sequential)] struct RStartStruct { p...

...enum SaType { SA_NORESTORE = 0,/* = 0 */ SA_RESTORE, SA_DEFAULT,/* was === SA_RESTORE */ SA_NOSAVE, SA_SAVE, SA_SAVEASK, SA_SUICIDE }; enum RBool { RFalse = 0, RTrue }; enum RYesNoCancel { Yes = 1, No = -1, Cancel = 0 }; enum RUIMode { RGui = 0, RTerm, LinkDLL }; [StructLayout(LayoutKind.Sequential)] struct RStartStruct { p...