[Qemu-devel] [PULL v2 01/33] target/sparc: Remove the constant pool

[Richard Henderson <richard.henderson@linaro.org>]

Partially reverts ab20bdc1162.  The 14-bit displacement that we
allowed to reach the constant pool is not always sufficient.
Retain the tb-relative addressing, as that is how most return
values from the tb are computed.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/sparc/tcg-target.inc.c | 47 ++++++++------------------------------
 1 file changed, 9 insertions(+), 38 deletions(-)

diff --git a/tcg/sparc/tcg-target.inc.c b/tcg/sparc/tcg-target.inc.c
index 04bdc3df5e..3237ae6a2f 100644
--- a/tcg/sparc/tcg-target.inc.c
+++ b/tcg/sparc/tcg-target.inc.c
@@ -311,24 +311,6 @@ static void patch_reloc(tcg_insn_unit *code_ptr, int type,
         insn &= ~INSN_OFF19(-1);
         insn |= INSN_OFF19(pcrel);
         break;
-    case R_SPARC_13:
-        /* Note that we're abusing this reloc type for our own needs.  */
-        if (!check_fit_ptr(value, 13)) {
-            int adj = (value > 0 ? 0xff8 : -0x1000);
-            value -= adj;
-            assert(check_fit_ptr(value, 13));
-            *code_ptr++ = (ARITH_ADD | INSN_RD(TCG_REG_T2)
-                           | INSN_RS1(TCG_REG_TB) | INSN_IMM13(adj));
-            insn ^= INSN_RS1(TCG_REG_TB) ^ INSN_RS1(TCG_REG_T2);
-        }
-        insn &= ~INSN_IMM13(-1);
-        insn |= INSN_IMM13(value);
-        break;
-    case R_SPARC_32:
-        /* Note that we're abusing this reloc type for our own needs.  */
-        code_ptr[0] = deposit32(code_ptr[0], 0, 22, value >> 10);
-        code_ptr[1] = deposit32(code_ptr[1], 0, 10, value);
-        return;
     default:
         g_assert_not_reached();
     }
@@ -459,6 +441,15 @@ static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
         return;
     }
 
+    /* A 13-bit constant relative to the TB.  */
+    if (!in_prologue && USE_REG_TB) {
+        test = arg - (uintptr_t)s->code_gen_ptr;
+        if (check_fit_ptr(test, 13)) {
+            tcg_out_arithi(s, ret, TCG_REG_TB, test, ARITH_ADD);
+            return;
+        }
+    }
+
     /* 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);
@@ -488,26 +479,6 @@ static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
         return;
     }
 
-    if (!in_prologue) {
-        if (USE_REG_TB) {
-            intptr_t diff = arg - (uintptr_t)s->code_gen_ptr;
-            if (check_fit_ptr(diff, 13)) {
-                tcg_out_arithi(s, ret, TCG_REG_TB, diff, ARITH_ADD);
-            } else {
-                new_pool_label(s, arg, R_SPARC_13, s->code_ptr,
-                               -(intptr_t)s->code_gen_ptr);
-                tcg_out32(s, LDX | INSN_RD(ret) | INSN_RS1(TCG_REG_TB));
-                /* May be used to extend the 13-bit range in patch_reloc.  */
-                tcg_out32(s, NOP);
-            }
-        } else {
-            new_pool_label(s, arg, R_SPARC_32, s->code_ptr, 0);
-            tcg_out_sethi(s, ret, 0);
-            tcg_out32(s, LDX | INSN_RD(ret) | INSN_RS1(ret) | INSN_IMM13(0));
-        }
-        return;
-    }
-
     /* A 64-bit constant decomposed into 2 32-bit pieces.  */
     if (check_fit_i32(lo, 13)) {
         hi = (arg - lo) >> 32;
-- 
2.17.2