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| author | Philipp Tomsich <philipp.tomsich@vrull.eu> | 2023-06-27 07:22:49 -0600 |
|---|---|---|
| committer | Jeff Law <jlaw@ventanamicro> | 2023-06-27 07:24:43 -0600 |
| commit | b625eff8a2346fe1107aa4ab7bbf4302f2c2136e (patch) | |
| tree | 9e11fce586187e074473ba6d38ea3e2be64c8697 /gas | |
| parent | 15d842846d1fd79e141b1eddc9f648a8200223da (diff) | |
| download | gdb-b625eff8a2346fe1107aa4ab7bbf4302f2c2136e.zip gdb-b625eff8a2346fe1107aa4ab7bbf4302f2c2136e.tar.gz gdb-b625eff8a2346fe1107aa4ab7bbf4302f2c2136e.tar.bz2 | |
RISC-V: Support Zicond extension
This implements the Zicond (conditional integer operations) extension,
as of version 1.0-rc2.
The Zicond extension acts as a building block for branchless sequences
including conditional-arithmetic, conditional-logic and
conditional-select/move.
The following instructions constitute Zicond:
- czero.eqz rd, rs1, rs2 => rd = (rs2 == 0) ? 0 : rs1
- czero.nez rd, rs1, rs2 => rd = (rs2 != 0) ? 0 : rs1
See
https://github.com/riscv/riscv-zicond/releases/download/v1.0-rc2/riscv-zicond-v1.0-rc2.pdf
for the proposed specification and usage details.
bfd/ChangeLog:
* elfxx-riscv.c (riscv_multi_subset_supports): Recognize
INSN_CLASS_ZICOND.
(riscv_multi_subset_supports_ext): Recognize INSN_CLASS_ZICOND.
gas/ChangeLog:
* testsuite/gas/riscv/zicond.d: New test.
* testsuite/gas/riscv/zicond.s: New test.
include/ChangeLog:
* opcode/riscv-opc.h (MATCH_CZERO_EQZ): Define.
(MASK_CZERO_EQZ): Define.
(MATCH_CZERO_NEZ): Define,
(MASK_CZERO_NEZ): Define.
(DECLARE_INSN): Add czero.eqz and czero.nez.
* opcode/riscv.h (enum riscv_insn_class): Add
INSN_CLASS_ZICOND.
opcodes/ChangeLog:
* riscv-opc.c: Add czero.eqz and czero.nez.
Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
Diffstat (limited to 'gas')
| -rw-r--r-- | gas/testsuite/gas/riscv/zicond.d | 12 | ||||
| -rw-r--r-- | gas/testsuite/gas/riscv/zicond.s | 3 |
2 files changed, 15 insertions, 0 deletions
diff --git a/gas/testsuite/gas/riscv/zicond.d b/gas/testsuite/gas/riscv/zicond.d new file mode 100644 index 0000000..7a79ee6 --- /dev/null +++ b/gas/testsuite/gas/riscv/zicond.d @@ -0,0 +1,12 @@ +#as: -march=rv64i_zicond +#source: zicond.s +#objdump: -d + +.*:[ ]+file format .* + + +Disassembly of section .text: + +0+000 <target>: +[ ]+0:[ ]+0ec5d533[ ]+czero.eqz[ ]+a0,a1,a2 +[ ]+4:[ ]+0ee6f533[ ]+czero.nez[ ]+a0,a3,a4 diff --git a/gas/testsuite/gas/riscv/zicond.s b/gas/testsuite/gas/riscv/zicond.s new file mode 100644 index 0000000..4e5edd5 --- /dev/null +++ b/gas/testsuite/gas/riscv/zicond.s @@ -0,0 +1,3 @@ +target: + czero.eqz a0, a1, a2 + czero.nez a0, a3, a4 |