change version to 0.12

Author: realqhc

llvm/docs/RISCVUsage.rst

@@ -336,7 +336,7 @@ The primary goal of experimental support is to assist in the process of ratifica
   LLVM implements the `0.3 draft specification <https://github.com/riscv/riscv-isa-manual/pull/1564>`__.
 
 ``experimental-p``, ``experimental-p``
-  LLVM implements the `012 specification <https://jhauser.us/RISCV/ext-P/RVP-baseInstrs-012.pdf>`__.
+  LLVM implements the `012 draft specification <https://jhauser.us/RISCV/ext-P/RVP-baseInstrs-012.pdf>`__.
 
 To use an experimental extension from `clang`, you must add `-menable-experimental-extensions` to the command line, and specify the exact version of the experimental extension you are using.  To use an experimental extension with LLVM's internal developer tools (e.g. `llc`, `llvm-objdump`, `llvm-mc`), you must prefix the extension name with `experimental-`.  Note that you don't need to specify the version with internal tools, and shouldn't include the `experimental-` prefix with `clang`.
 

llvm/lib/Target/RISCV/RISCVFeatures.td

@@ -1018,7 +1018,7 @@ def HasStdExtSmctrOrSsctr : Predicate<"Subtarget->hasStdExtSmctrOrSsctr()">,
 
 // Packed SIMD Extensions
 def FeatureStdExtP
-    : RISCVExperimentalExtension<1, 0,
+    : RISCVExperimentalExtension<0, 12,
                                  "'Base P' (Packed SIMD)">;
 def HasStdExtP : Predicate<"Subtarget->hasStdExtP()">,
                  AssemblerPredicate<(all_of FeatureStdExtP),

llvm/test/MC/RISCV/attribute-arch.s

@@ -475,7 +475,7 @@
 # CHECK: attribute      5, "rv32i2p1_sdtrig1p0"
 
 .attribute arch, "rv32i_p1p0"
-# CHECK: attribute      5, "rv32i2p1_p1p0"
+# CHECK: attribute      5, "rv32i2p1_p0p12"
 
 .attribute arch, "rv64i_p1p0"
-# CHECK: attribute      5, "rv64i2p1_p1p0"
+# CHECK: attribute      5, "rv64i2p1_p0p12"

llvm/unittests/TargetParser/RISCVISAInfoTest.cpp

@@ -1105,7 +1105,7 @@ R"(All available -march extensions for RISC-V
     xwchc                2.2
 
 Experimental extensions
-    p                    1.0
+    p                    0.12
     zicfilp              1.0       This is a long dummy description
     zicfiss              1.0
     zalasr               0.1