[PATCH] D92185: [SystemZ] Adding extra extended mnemonics for SystemZ target

Anirudh Prasad via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Thu Nov 26 08:42:22 PST 2020

anirudhp created this revision.
anirudhp added reviewers: uweigand, jonpa, Kai.
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- This patch consists of the addition of some common additional extended mnemonics to the SystemZ target
- These are jnop, jct, jctg, jas, jasl, jxh, jxhg, jxle, jxleg, bru, brul, br*, br*l.
- These mnemonics and the instructions they map to are defined here <https://www.ibm.com/support/knowledgecenter/SSENW6_1.6.0/com.ibm.hlasm.v1r6.asm/asmr1023.pdf>, Chapter 4 - Branching with extended mnemonic codes
- Except for `jnop` (which is a variant of `brc 0, label`), every other mnemonic is marked as a `MnemonicAlias` since there is already a "defined" instruction with the same encoding and/or condition mask values
- `brc 0, label` doesn't have a defined extended mnemonic, thus jnop is defined using as an `InstAlias`.
- Furthermore, the `applyMnemonicAliases` function is called in the overridden parseInstruction function in SystemZAsmParser.cpp to ensure any mnemonic aliases are applied before any further processing on the instruction is done.

  rG LLVM Github Monorepo



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