From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 26 Sep 2018 15:25:04 +0000 (+0100)
Subject: save some cpu cycles by |ing the checks for vectorop together
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=eedb9456063cb69f1c6a4e40c8694e14e8369e44;p=riscv-isa-sim.git

save some cpu cycles by |ing the checks for vectorop together
---

diff --git a/riscv/insn_template_sv.cc b/riscv/insn_template_sv.cc
index 3163a34..6fa9623 100644
--- a/riscv/insn_template_sv.cc
+++ b/riscv/insn_template_sv.cc
@@ -16,36 +16,37 @@ reg_t FN(processor_t* p, insn_t s_insn, reg_t pc)
   // REGS_PATTERN is generated by id_regs.py (per opcode)
   unsigned int floatintmap = REGS_PATTERN;
   sv_insn_t insn(bits, floatintmap);
-  bool vectorop = false;
   reg_t predicate = 0;
   // identify which regs have had their CSR entries set as vectorised.
   // really could do with a macro for-loop here... oh well...
   // integer ops, RD, RS1, RS2, RS3 (use sv_int_tb)
+  bool vectorop =
 #ifdef USING_RD
-  vectorop |= check_reg(true, s_insn.rd());
+  check_reg(true, s_insn.rd()) |
 #endif
 #ifdef USING_RS1
-  vectorop |= check_reg(true, s_insn.rs1());
+  check_reg(true, s_insn.rs1()) |
 #endif
 #ifdef USING_RS2
-  vectorop |= check_reg(true, s_insn.rs2());
+  check_reg(true, s_insn.rs2()) |
 #endif
 #ifdef USING_RS2
-  vectorop |= check_reg(true, s_insn.rs3());
+ check_reg(true, s_insn.rs3()) |
 #endif
   // fp ops, RD, RS1, RS2, RS3 (use sv_fp_tb)
 #ifdef USING_FRD
-  vectorop |= check_reg(false, s_insn.frd());
+  check_reg(false, s_insn.frd()) |
 #endif
 #ifdef USING_FRS1
-  vectorop |= check_reg(false, s_insn.frs1());
+  check_reg(false, s_insn.frs1()) |
 #endif
 #ifdef USING_FRS2
-  vectorop |= check_reg(false, s_insn.rs2());
+  check_reg(false, s_insn.rs2()) |
 #endif
 #ifdef USING_FRS2
-  vectorop |= check_reg(false, s_insn.rs3());
+  check_reg(false, s_insn.rs3()) |
 #endif
+  false; // save a few cycles by |ing the checks together.
 
   // if vectorop is set, one of the regs is not a scalar,
   // so we must read the VL CSR and do a loop