Merge pull request #303 from tactcomplabs/csrs_pseudoinstruction

Add csrs pseudoinstruction

Author: leekillough

include/insns/Zicsr.h

@@ -100,7 +100,8 @@ class Zicsr : public RevExt {
     RevZicsrInstDefaults().SetMnemonic( "fsflags %rs"            ).SetFunct3( 0b001 ).SetImplFunc( csrrw      ).SetPredicate( []( uint32_t Inst ){ return DECODE_RD( Inst ) != 0 && DECODE_IMM12( Inst ) == 0x1; } ),
     RevZicsrInstDefaults().SetMnemonic( "fsrm %rs"               ).SetFunct3( 0b001 ).SetImplFunc( csrrw      ).SetPredicate( []( uint32_t Inst ){ return DECODE_RD( Inst ) != 0 && DECODE_IMM12( Inst ) == 0x2; } ),
 
-    RevZicsrInstDefaults().SetMnemonic( "csrrs %rd, %csr, %rs1"  ).SetFunct3( 0b010 ).SetImplFunc( csrrs      ).SetPredicate( []( uint32_t Inst ){ return DECODE_RS1( Inst ) != 0; } ),
+    RevZicsrInstDefaults().SetMnemonic( "csrrs %rd, %csr, %rs1"  ).SetFunct3( 0b010 ).SetImplFunc( csrrs      ).SetPredicate( []( uint32_t Inst ){ return DECODE_RS1( Inst ) != 0 && DECODE_RD( Inst ) != 0; } ),
+    RevZicsrInstDefaults().SetMnemonic( "csrs %csr, %rs1"        ).SetFunct3( 0b010 ).SetImplFunc( csrrs      ).SetPredicate( []( uint32_t Inst ){ return DECODE_RS1( Inst ) != 0 && DECODE_RD( Inst ) == 0; } ),
     RevZicsrInstDefaults().SetMnemonic( "csrr %rd, %csr"         ).SetFunct3( 0b010 ).SetImplFunc( csrrs      ).SetPredicate( []( uint32_t Inst ){ return DECODE_RS1( Inst ) == 0 && DECODE_IMM12( Inst ) != 0x1 && DECODE_IMM12( Inst ) != 0x2 && [](auto imm){ return imm < 0xc80 || imm > 0xc82; }( DECODE_IMM12( Inst ) | 0x80 ); } ),
     RevZicsrInstDefaults().SetMnemonic( "frflags %rd"            ).SetFunct3( 0b010 ).SetImplFunc( csrrs      ).SetPredicate( []( uint32_t Inst ){ return DECODE_RS1( Inst ) == 0 && DECODE_IMM12( Inst ) == 0x1; } ),
     RevZicsrInstDefaults().SetMnemonic( "frrm %rd"               ).SetFunct3( 0b010 ).SetImplFunc( csrrs      ).SetPredicate( []( uint32_t Inst ){ return DECODE_RS1( Inst ) == 0 && DECODE_IMM12( Inst ) == 0x2; } ),