diff mbox series

[v6,2/8] tcg/sparc: Split out tcg_out_movi_imm32

Message ID 20220208071710.320122-3-richard.henderson@linaro.org
State Superseded
Headers show
Series tcg/sparc: Unaligned access for user-only | expand

Commit Message

Richard Henderson Feb. 8, 2022, 7:17 a.m. UTC 
Handle 32-bit constants with a separate function, so that
tcg_out_movi_int does not need to recurse.  This slightly
rearranges the order of tests for small constants, but
produces the same output.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/sparc/tcg-target.c.inc | 36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

Comments

Peter Maydell Feb. 8, 2022, 10:44 a.m. UTC | #1 
On Tue, 8 Feb 2022 at 07:17, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> Handle 32-bit constants with a separate function, so that
> tcg_out_movi_int does not need to recurse.  This slightly
> rearranges the order of tests for small constants, but
> produces the same output.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---

Dropping the recursion makes this function definitely
easier to reason about.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM
diff mbox series

Patch

diff --git a/tcg/sparc/tcg-target.c.inc b/tcg/sparc/tcg-target.c.inc
index 82a7c684b6..576903e0d8 100644
--- a/tcg/sparc/tcg-target.c.inc
+++ b/tcg/sparc/tcg-target.c.inc
@@ -413,15 +413,30 @@  static void tcg_out_movi_imm13(TCGContext *s, TCGReg ret, int32_t arg)
     tcg_out_arithi(s, ret, TCG_REG_G0, arg, ARITH_OR);
 }
 
+static void tcg_out_movi_imm32(TCGContext *s, TCGReg ret, int32_t arg)
+{
+    if (check_fit_i32(arg, 13)) {
+        /* A 13-bit constant sign-extended to 64-bits.  */
+        tcg_out_movi_imm13(s, ret, arg);
+    } else {
+        /* A 32-bit constant zero-extended to 64 bits.  */
+        tcg_out_sethi(s, ret, arg);
+        if (arg & 0x3ff) {
+            tcg_out_arithi(s, ret, ret, arg & 0x3ff, ARITH_OR);
+        }
+    }
+}
+
 static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
                              tcg_target_long arg, bool in_prologue)
 {
     tcg_target_long hi, lo = (int32_t)arg;
     tcg_target_long test, lsb;
 
-    /* Make sure we test 32-bit constants for imm13 properly.  */
-    if (type == TCG_TYPE_I32) {
-        arg = lo;
+    /* A 32-bit constant, or 32-bit zero-extended to 64-bits.  */
+    if (type == TCG_TYPE_I32 || arg == (uint32_t)arg) {
+        tcg_out_movi_imm32(s, ret, arg);
+        return;
     }
 
     /* A 13-bit constant sign-extended to 64-bits.  */
@@ -439,15 +454,6 @@  static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
         }
     }
 
-    /* A 32-bit constant, or 32-bit zero-extended to 64-bits.  */
-    if (type == TCG_TYPE_I32 || arg == (uint32_t)arg) {
-        tcg_out_sethi(s, ret, arg);
-        if (arg & 0x3ff) {
-            tcg_out_arithi(s, ret, ret, arg & 0x3ff, ARITH_OR);
-        }
-        return;
-    }
-
     /* A 32-bit constant sign-extended to 64-bits.  */
     if (arg == lo) {
         tcg_out_sethi(s, ret, ~arg);
@@ -471,13 +477,13 @@  static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
     /* A 64-bit constant decomposed into 2 32-bit pieces.  */
     if (check_fit_i32(lo, 13)) {
         hi = (arg - lo) >> 32;
-        tcg_out_movi(s, TCG_TYPE_I32, ret, hi);
+        tcg_out_movi_imm32(s, ret, hi);
         tcg_out_arithi(s, ret, ret, 32, SHIFT_SLLX);
         tcg_out_arithi(s, ret, ret, lo, ARITH_ADD);
     } else {
         hi = arg >> 32;
-        tcg_out_movi(s, TCG_TYPE_I32, ret, hi);
-        tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_T2, lo);
+        tcg_out_movi_imm32(s, ret, hi);
+        tcg_out_movi_imm32(s, TCG_REG_T2, lo);
         tcg_out_arithi(s, ret, ret, 32, SHIFT_SLLX);
         tcg_out_arith(s, ret, ret, TCG_REG_T2, ARITH_OR);
     }