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[PULL,26/34] tcg/sparc: Use tcg_out_movi_imm13 in tcg_out_addsub2_i64

Message ID 20220211013059.17994-27-richard.henderson@linaro.org
State New
Headers show
Series [PULL,01/34] common-user/host/sparc64: Fix safe_syscall_base | expand

Commit Message

Richard Henderson Feb. 11, 2022, 1:30 a.m. UTC 
When BH is constant, it is constrained to 11 bits for use in MOVCC.
For the cases in which we must load the constant BH into a register,
we do not need the full logic of tcg_out_movi; we can use the simpler
function for emitting a 13 bit constant.

This eliminates the only case in which TCG_REG_T2 was passed to
tcg_out_movi, which will shortly become invalid.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/sparc/tcg-target.c.inc | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
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Patch

diff --git a/tcg/sparc/tcg-target.c.inc b/tcg/sparc/tcg-target.c.inc
index 0c062c60eb..8d5992ef29 100644
--- a/tcg/sparc/tcg-target.c.inc
+++ b/tcg/sparc/tcg-target.c.inc
@@ -795,7 +795,7 @@  static void tcg_out_addsub2_i64(TCGContext *s, TCGReg rl, TCGReg rh,
     if (use_vis3_instructions && !is_sub) {
         /* Note that ADDXC doesn't accept immediates.  */
         if (bhconst && bh != 0) {
-           tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_T2, bh);
+           tcg_out_movi_imm13(s, TCG_REG_T2, bh);
            bh = TCG_REG_T2;
         }
         tcg_out_arith(s, rh, ah, bh, ARITH_ADDXC);
@@ -811,9 +811,13 @@  static void tcg_out_addsub2_i64(TCGContext *s, TCGReg rl, TCGReg rh,
 	    tcg_out_movcc(s, TCG_COND_GEU, MOVCC_XCC, rh, ah, 0);
 	}
     } else {
-        /* Otherwise adjust BH as if there is carry into T2 ... */
+        /*
+         * Otherwise adjust BH as if there is carry into T2.
+         * Note that constant BH is constrained to 11 bits for the MOVCC,
+         * so the adjustment fits 12 bits.
+         */
         if (bhconst) {
-            tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_T2, bh + (is_sub ? -1 : 1));
+            tcg_out_movi_imm13(s, TCG_REG_T2, bh + (is_sub ? -1 : 1));
         } else {
             tcg_out_arithi(s, TCG_REG_T2, bh, 1,
                            is_sub ? ARITH_SUB : ARITH_ADD);