tcg/mips: Simplify constraints on qemu_ld/st

The softmmu tlb uses TCG_REG_TMP[0-3], not any of the normally available
registers.  Now that we handle overlap betwen inputs and helper arguments,
and have eliminated use of A0, we can allow any allocatable reg.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

3 files changed, 13 insertions, 32 deletions

diff --git a/tcg/mips/tcg-target-con-set.h b/tcg/mips/tcg-target-con-set.h
index fe3e868..864034f 100644
--- a/tcg/mips/tcg-target-con-set.h
+++ b/tcg/mips/tcg-target-con-set.h
@@ -12,15 +12,13 @@
 C_O0_I1(r)
 C_O0_I2(rZ, r)
 C_O0_I2(rZ, rZ)
-C_O0_I2(SZ, S)
-C_O0_I3(SZ, S, S)
-C_O0_I3(SZ, SZ, S)
+C_O0_I3(rZ, r, r)
+C_O0_I3(rZ, rZ, r)
 C_O0_I4(rZ, rZ, rZ, rZ)
-C_O0_I4(SZ, SZ, S, S)
-C_O1_I1(r, L)
+C_O0_I4(rZ, rZ, r, r)
 C_O1_I1(r, r)
 C_O1_I2(r, 0, rZ)
-C_O1_I2(r, L, L)
+C_O1_I2(r, r, r)
 C_O1_I2(r, r, ri)
 C_O1_I2(r, r, rI)
 C_O1_I2(r, r, rIK)
@@ -30,7 +28,6 @@ C_O1_I2(r, rZ, rN)
 C_O1_I2(r, rZ, rZ)
 C_O1_I4(r, rZ, rZ, rZ, 0)
 C_O1_I4(r, rZ, rZ, rZ, rZ)
-C_O2_I1(r, r, L)
-C_O2_I2(r, r, L, L)
+C_O2_I1(r, r, r)
 C_O2_I2(r, r, r, r)
 C_O2_I4(r, r, rZ, rZ, rN, rN)
diff --git a/tcg/mips/tcg-target-con-str.h b/tcg/mips/tcg-target-con-str.h
index e4b2965..413c280 100644
--- a/tcg/mips/tcg-target-con-str.h
+++ b/tcg/mips/tcg-target-con-str.h
@@ -9,8 +9,6 @@
  * REGS(letter, register_mask)
  */
 REGS('r', ALL_GENERAL_REGS)
-REGS('L', ALL_QLOAD_REGS)
-REGS('S', ALL_QSTORE_REGS)
 
 /*
  * Define constraint letters for constants:
diff --git a/tcg/mips/tcg-target.c.inc b/tcg/mips/tcg-target.c.inc
index 695c137..5ad9867 100644
--- a/tcg/mips/tcg-target.c.inc
+++ b/tcg/mips/tcg-target.c.inc
@@ -176,20 +176,6 @@ static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
 #define TCG_CT_CONST_WSZ  0x2000   /* word size */
 
 #define ALL_GENERAL_REGS  0xffffffffu
-#define NOA0_REGS         (ALL_GENERAL_REGS & ~(1 << TCG_REG_A0))
-
-#ifdef CONFIG_SOFTMMU
-#define ALL_QLOAD_REGS \
-    (NOA0_REGS & ~((TCG_TARGET_REG_BITS < TARGET_LONG_BITS) << TCG_REG_A2))
-#define ALL_QSTORE_REGS \
-    (NOA0_REGS & ~(TCG_TARGET_REG_BITS < TARGET_LONG_BITS   \
-                   ? (1 << TCG_REG_A2) | (1 << TCG_REG_A3)  \
-                   : (1 << TCG_REG_A1)))
-#else
-#define ALL_QLOAD_REGS   NOA0_REGS
-#define ALL_QSTORE_REGS  NOA0_REGS
-#endif
-
 
 static bool is_p2m1(tcg_target_long val)
 {
@@ -2232,18 +2218,18 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
 
     case INDEX_op_qemu_ld_i32:
         return (TCG_TARGET_REG_BITS == 64 || TARGET_LONG_BITS == 32
-                ? C_O1_I1(r, L) : C_O1_I2(r, L, L));
+                ? C_O1_I1(r, r) : C_O1_I2(r, r, r));
     case INDEX_op_qemu_st_i32:
         return (TCG_TARGET_REG_BITS == 64 || TARGET_LONG_BITS == 32
-                ? C_O0_I2(SZ, S) : C_O0_I3(SZ, S, S));
+                ? C_O0_I2(rZ, r) : C_O0_I3(rZ, r, r));
     case INDEX_op_qemu_ld_i64:
-        return (TCG_TARGET_REG_BITS == 64 ? C_O1_I1(r, L)
-                : TARGET_LONG_BITS == 32 ? C_O2_I1(r, r, L)
-                : C_O2_I2(r, r, L, L));
+        return (TCG_TARGET_REG_BITS == 64 ? C_O1_I1(r, r)
+                : TARGET_LONG_BITS == 32 ? C_O2_I1(r, r, r)
+                : C_O2_I2(r, r, r, r));
     case INDEX_op_qemu_st_i64:
-        return (TCG_TARGET_REG_BITS == 64 ? C_O0_I2(SZ, S)
-                : TARGET_LONG_BITS == 32 ? C_O0_I3(SZ, SZ, S)
-                : C_O0_I4(SZ, SZ, S, S));
+        return (TCG_TARGET_REG_BITS == 64 ? C_O0_I2(rZ, r)
+                : TARGET_LONG_BITS == 32 ? C_O0_I3(rZ, rZ, r)
+                : C_O0_I4(rZ, rZ, r, r));
 
     default:
         g_assert_not_reached();