8315612: RISC-V: intrinsic for unsignedMultiplyHigh

Backport-of: 5d3fdc1750645455d64a341e1437f779ba3fd20c
openjdk · Sep 8, 2023 · 9343d46 · 9343d46 · openjdk-notifier · Sep 8, 2023
1 parent 8477ff8
commit 9343d46
Showing 1 changed file with 15 additions and 0 deletions.
diff --git a/src/hotspot/cpu/riscv/riscv.ad b/src/hotspot/cpu/riscv/riscv.ad
@@ -6859,6 +6859,21 @@ instruct mulHiL_rReg(iRegLNoSp dst, iRegL src1, iRegL src2)
   ins_pipe(lmul_reg_reg);
 %}
 
+instruct umulHiL_rReg(iRegLNoSp dst, iRegL src1, iRegL src2)
+%{
+  match(Set dst (UMulHiL src1 src2));
+  ins_cost(IMUL_COST);
+  format %{ "mulhu  $dst, $src1, $src2\t# umulhi, #@umulHiL_rReg" %}
+
+  ins_encode %{
+    __ mulhu(as_Register($dst$$reg),
+             as_Register($src1$$reg),
+             as_Register($src2$$reg));
+  %}
+
+  ins_pipe(lmul_reg_reg);
+%}
+
 // Integer Divide
 
 instruct divI(iRegINoSp dst, iRegIorL2I src1, iRegIorL2I src2) %{