diff options
Diffstat (limited to 'llvm/lib/Target/Hexagon/RDFGraph.h')
| -rw-r--r-- | llvm/lib/Target/Hexagon/RDFGraph.h | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/llvm/lib/Target/Hexagon/RDFGraph.h b/llvm/lib/Target/Hexagon/RDFGraph.h index 596bf342885..79ae8850ab9 100644 --- a/llvm/lib/Target/Hexagon/RDFGraph.h +++ b/llvm/lib/Target/Hexagon/RDFGraph.h @@ -191,6 +191,13 @@ // imply that the use in (3) may indeed be reached by some prior def. // Adding Undef flag to the def in (1) prevents that. The Undef flag // may be applied to both defs and uses. +// - Dead: applies only to defs. The value coming out of a "dead" def is +// assumed to be unused, even if the def appears to be reaching other defs +// or uses. The motivation for this flag comes from dead defs on function +// calls: there is no way to determine if such a def is dead without +// analyzing the target's ABI. Hence the graph should contain this info, +// as it is unavailable otherwise. On the other hand, a def without any +// uses on a typical instruction is not the intended target for this flag. // // *** Shadow references // @@ -261,14 +268,15 @@ namespace rdf { Block = 0x0005 << 2, // 101 Func = 0x0006 << 2, // 110 - // Flags: 6 bits for now - FlagMask = 0x003F << 5, - Shadow = 0x0001 << 5, // 000001, Has extra reaching defs. - Clobbering = 0x0002 << 5, // 000010, Produces unspecified values. - PhiRef = 0x0004 << 5, // 000100, Member of PhiNode. - Preserving = 0x0008 << 5, // 001000, Def can keep original bits. - Fixed = 0x0010 << 5, // 010000, Fixed register. - Undef = 0x0020 << 5, // 100000, Has no pre-existing value. + // Flags: 7 bits for now + FlagMask = 0x007F << 5, + Shadow = 0x0001 << 5, // 0000001, Has extra reaching defs. + Clobbering = 0x0002 << 5, // 0000010, Produces unspecified values. + PhiRef = 0x0004 << 5, // 0000100, Member of PhiNode. + Preserving = 0x0008 << 5, // 0001000, Def can keep original bits. + Fixed = 0x0010 << 5, // 0010000, Fixed register. + Undef = 0x0020 << 5, // 0100000, Has no pre-existing value. + Dead = 0x0040 << 5, // 1000000, Does not define a value. }; static uint16_t type(uint16_t T) { return T & TypeMask; } |
