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| author | Mark Ryan <markdryan@rivosinc.com> | 2025-05-06 13:02:34 +0200 |
|---|---|---|
| committer | Mark Ryan <markdryan@rivosinc.com> | 2025-05-08 01:52:12 -0700 |
| commit | 5a1f47a7f716ce0dbd88128d18ce556dd9280c68 (patch) | |
| tree | 0420d31ee5c63ed05373c79a21a974c5a0023fec /src/cmd/internal/obj | |
| parent | d13da63929df73ab506314f35524ebb9b0f8a216 (diff) | |
| download | go-5a1f47a7f716ce0dbd88128d18ce556dd9280c68.tar.xz | |
cmd/internal/obj/riscv: fix LMUL encoding for MF2 and MF8
The encodings for the riscv64 special operands SPOP_MF2 and SPOP_MF8
are incorrect, i.e., their values are swapped. This leads to
incorrect encodings for the VSETVLI and VSETIVLI instructions. The
assembler currently encodes
VSETVLI X10, E32, MF8, TA, MA, X12
as
VSETVLI X10, E32, MF2, TA, MA, X12
We update the encodings for SPOP_MF2 and SPOP_MF8 so that they match
the LMUL table in section "31.3.4. Vector type register, vtype" of
the "RISC-V Instruction Set Manual Volume 1".
Change-Id: Ic73355533d7c2a901ee060b35c2f7af6d58453e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/670016
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Diffstat (limited to 'src/cmd/internal/obj')
| -rw-r--r-- | src/cmd/internal/obj/riscv/cpu.go | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/cmd/internal/obj/riscv/cpu.go b/src/cmd/internal/obj/riscv/cpu.go index d87b6b1efb..382c08a9d9 100644 --- a/src/cmd/internal/obj/riscv/cpu.go +++ b/src/cmd/internal/obj/riscv/cpu.go @@ -1297,9 +1297,9 @@ var specialOperands = map[SpecialOperand]struct { SPOP_M2: {encoding: 1, name: "M2"}, SPOP_M4: {encoding: 2, name: "M4"}, SPOP_M8: {encoding: 3, name: "M8"}, - SPOP_MF2: {encoding: 5, name: "MF2"}, + SPOP_MF8: {encoding: 5, name: "MF8"}, SPOP_MF4: {encoding: 6, name: "MF4"}, - SPOP_MF8: {encoding: 7, name: "MF8"}, + SPOP_MF2: {encoding: 7, name: "MF2"}, SPOP_E8: {encoding: 0, name: "E8"}, SPOP_E16: {encoding: 1, name: "E16"}, |