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| author | Pirama Arumuga Nainar <pirama@google.com> | 2015-05-06 11:46:36 -0700 |
|---|---|---|
| committer | Pirama Arumuga Nainar <pirama@google.com> | 2015-05-18 10:52:30 -0700 |
| commit | 2c3e0051c31c3f5b2328b447eadf1cf9c4427442 (patch) | |
| tree | c0104029af14e9f47c2ef58ca60e6137691f3c9b /lib/Target/PowerPC/README.txt | |
| parent | e1bc145815f4334641be19f1c45ecf85d25b6e5a (diff) | |
| download | external_llvm-2c3e0051c31c3f5b2328b447eadf1cf9c4427442.zip external_llvm-2c3e0051c31c3f5b2328b447eadf1cf9c4427442.tar.gz external_llvm-2c3e0051c31c3f5b2328b447eadf1cf9c4427442.tar.bz2 | |
Update aosp/master LLVM for rebase to r235153
Change-Id: I9bf53792f9fc30570e81a8d80d296c681d005ea7
(cherry picked from commit 0c7f116bb6950ef819323d855415b2f2b0aad987)
Diffstat (limited to 'lib/Target/PowerPC/README.txt')
| -rw-r--r-- | lib/Target/PowerPC/README.txt | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/README.txt b/lib/Target/PowerPC/README.txt index dfe988f..01233ae 100644 --- a/lib/Target/PowerPC/README.txt +++ b/lib/Target/PowerPC/README.txt @@ -622,6 +622,25 @@ void foo() { __asm__("" ::: "cr2"); } +//===-------------------------------------------------------------------------=== +Naming convention for instruction formats is very haphazard. +We have agreed on a naming scheme as follows: + +<INST_form>{_<OP_type><OP_len>}+ + +Where: +INST_form is the instruction format (X-form, etc.) +OP_type is the operand type - one of OPC (opcode), RD (register destination), + RS (register source), + RDp (destination register pair), + RSp (source register pair), IM (immediate), + XO (extended opcode) +OP_len is the length of the operand in bits + +VSX register operands would be of length 6 (split across two fields), +condition register fields of length 3. +We would not need denote reserved fields in names of instruction formats. + //===----------------------------------------------------------------------===// Instruction fusion was introduced in ISA 2.06 and more opportunities added in |