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Diffstat (limited to 'include/llvm/Target/Target.td')
| -rw-r--r-- | include/llvm/Target/Target.td | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/llvm/Target/Target.td b/include/llvm/Target/Target.td index 7db2e86..39f4ba7 100644 --- a/include/llvm/Target/Target.td +++ b/include/llvm/Target/Target.td @@ -530,6 +530,25 @@ class AsmParser { def DefaultAsmParser : AsmParser; +/// MnemonicAlias - This class allows targets to define assembler mnemonic +/// aliases. This should be used when all forms of one mnemonic are accepted +/// with a different mnemonic. For example, X86 allows: +/// sal %al, 1 -> shl %al, 1 +/// sal %ax, %cl -> shl %ax, %cl +/// sal %eax, %cl -> shl %eax, %cl +/// etc. Though "sal" is accepted with many forms, all of them are directly +/// translated to a shl, so it can be handled with (in the case of X86, it +/// actually has one for each suffix as well): +/// def : MnemonicAlias<"sal", "shl">; +/// +/// Mnemonic aliases are mapped before any other translation in the match phase. +/// +class MnemonicAlias<string From, string To> { + string FromMnemonic = From; + string ToMnemonic = To; +} + + //===----------------------------------------------------------------------===// // AsmWriter - This class can be implemented by targets that need to customize // the format of the .s file writer. |