diff options
Diffstat (limited to 'tcg/sparc')
| -rw-r--r-- | tcg/sparc/tcg-target.c | 33 |
1 files changed, 19 insertions, 14 deletions
diff --git a/tcg/sparc/tcg-target.c b/tcg/sparc/tcg-target.c index 3144044a43..31e8204b31 100644 --- a/tcg/sparc/tcg-target.c +++ b/tcg/sparc/tcg-target.c @@ -617,32 +617,37 @@ static void tcg_out_brcond2_i32(TCGContext *s, TCGCond cond, static void tcg_out_setcond_i32(TCGContext *s, TCGCond cond, TCGArg ret, TCGArg c1, TCGArg c2, int c2const) { - TCGArg t; - /* For 32-bit comparisons, we can play games with ADDX/SUBX. */ switch (cond) { + case TCG_COND_LTU: + case TCG_COND_GEU: + /* The result of the comparison is in the carry bit. */ + break; + case TCG_COND_EQ: case TCG_COND_NE: + /* For equality, we can transform to inequality vs zero. */ if (c2 != 0) { tcg_out_arithc(s, ret, c1, c2, c2const, ARITH_XOR); } c1 = TCG_REG_G0, c2 = ret, c2const = 0; - cond = (cond == TCG_COND_EQ ? TCG_COND_LEU : TCG_COND_LTU); + cond = (cond == TCG_COND_EQ ? TCG_COND_GEU : TCG_COND_LTU); break; case TCG_COND_GTU: - case TCG_COND_GEU: - if (c2const && c2 != 0) { - tcg_out_movi_imm13(s, TCG_REG_T1, c2); - c2 = TCG_REG_T1; - } - t = c1, c1 = c2, c2 = t, c2const = 0; - cond = tcg_swap_cond(cond); - break; - - case TCG_COND_LTU: case TCG_COND_LEU: - break; + /* If we don't need to load a constant into a register, we can + swap the operands on GTU/LEU. There's no benefit to loading + the constant into a temporary register. */ + if (!c2const || c2 == 0) { + TCGArg t = c1; + c1 = c2; + c2 = t; + c2const = 0; + cond = tcg_swap_cond(cond); + break; + } + /* FALLTHRU */ default: tcg_out_cmp(s, c1, c2, c2const); |