rvv: vsbc/vmsbc behavior of the sub order

6 years ago · 169dfe7ceb
4 changed files with 4 additions and 4 deletions
--- a/riscv/insns/vmsbc_vvm.h
+++ b/riscv/insns/vmsbc_vvm.h
@ -6,7 +6,7 @@ VI_VV_LOOP_CARRY
  const uint128_t op_mask = (UINT64_MAX >> (64 - sew));
  uint64_t carry = insn.v_vm() == 0 ? (v0 >> mpos) & 0x1 : 0;

-  uint128_t res = (op_mask & vs1) - (op_mask & vs2) - carry;
+  uint128_t res = (op_mask & vs2) - (op_mask & vs1) - carry;

  carry = (res >> sew) & 0x1u;
  vd = (vd & ~mmask) | ((carry << mpos) & mmask);
--- a/riscv/insns/vmsbc_vxm.h
+++ b/riscv/insns/vmsbc_vxm.h
@ -6,7 +6,7 @@ VI_XI_LOOP_CARRY
  const uint128_t op_mask = (UINT64_MAX >> (64 - sew));
  uint64_t carry = insn.v_vm() == 0 ? (v0 >> mpos) & 0x1 : 0;

-  uint128_t res = (op_mask & rs1) - (op_mask & vs2) - carry;
+  uint128_t res = (op_mask & vs2) - (op_mask & rs1) - carry;

  carry = (res >> sew) & 0x1u;
  vd = (vd & ~mmask) | ((carry << mpos) & mmask);
--- a/riscv/insns/vsbc_vvm.h
+++ b/riscv/insns/vsbc_vvm.h
@ -5,6 +5,6 @@ VI_VV_LOOP_WITH_CARRY
  const uint128_t op_mask = (UINT64_MAX >> (64 - sew));
  uint64_t carry = (v0 >> mpos) & 0x1;

-  uint128_t res = (op_mask & vs1) - (op_mask & vs2) - carry;
+  uint128_t res = (op_mask & vs2) - (op_mask & vs1) - carry;
  vd = res;
 })
--- a/riscv/insns/vsbc_vxm.h
+++ b/riscv/insns/vsbc_vxm.h
@ -5,6 +5,6 @@ VI_XI_LOOP_WITH_CARRY
  const uint128_t op_mask = (UINT64_MAX >> (64 - sew));
  uint64_t carry = (v0 >> mpos) & 0x1;

-  uint128_t res = (op_mask & rs1) - (op_mask & vs2) - carry;
+  uint128_t res = (op_mask & vs2) - (op_mask & rs1) - carry;
  vd = res;
 })