commit e318a60b94b152c1e80125861a8917ae177d845e
author Peter Maydell <peter.maydell@linaro.org> Tue Mar 15 16:26:52 2011 +0000
committer Aurelien Jarno <aurelien@aurel32.net> Fri Apr 01 22:33:47 2011 +0200
tree a419e4ab49039d317ccffdbf5d8e423a9a1f9e69
parent 8e18cde30b06d2e7411bf38091c4e30602f85cdd

target-arm: Don't leak TCG temp for UNDEFs in Neon load/store space

Move the allocation and freeing of the TCG temp used for the address for
Neon load/store instructions so that we don't allocate the temporary
until we've done enough decoding to know that the instruction is not
an UNDEF pattern; this avoids leaking the TCG temp in these cases.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

target-arm/translate.c

diff --git a/target-arm/translate.c b/target-arm/translate.c
index 1dfd482..39512bc 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -3810,7 +3810,6 @@
     rn = (insn >> 16) & 0xf;
     rm = insn & 0xf;
     load = (insn & (1 << 21)) != 0;
-    addr = tcg_temp_new_i32();
     if ((insn & (1 << 23)) == 0) {
         /* Load store all elements.  */
         op = (insn >> 8) & 0xf;
@@ -3822,6 +3821,7 @@
         spacing = neon_ls_element_type[op].spacing;
         if (size == 3 && (interleave | spacing) != 1)
             return 1;
+        addr = tcg_temp_new_i32();
         load_reg_var(s, addr, rn);
         stride = (1 << size) * interleave;
         for (reg = 0; reg < nregs; reg++) {
@@ -3907,6 +3907,7 @@
             }
             rd += spacing;
         }
+        tcg_temp_free_i32(addr);
         stride = nregs * 8;
     } else {
         size = (insn >> 10) & 3;
@@ -3932,6 +3933,7 @@
             if (nregs == 3 && a == 1) {
                 return 1;
             }
+            addr = tcg_temp_new_i32();
             load_reg_var(s, addr, rn);
             if (nregs == 1) {
                 /* VLD1 to all lanes: bit 5 indicates how many Dregs to write */
@@ -3955,6 +3957,7 @@
                     rd += stride;
                 }
             }
+            tcg_temp_free_i32(addr);
             stride = (1 << size) * nregs;
         } else {
             /* Single element.  */
@@ -3976,6 +3979,7 @@
                 abort();
             }
             nregs = ((insn >> 8) & 3) + 1;
+            addr = tcg_temp_new_i32();
             load_reg_var(s, addr, rn);
             for (reg = 0; reg < nregs; reg++) {
                 if (load) {
@@ -4017,10 +4021,10 @@
                 rd += stride;
                 tcg_gen_addi_i32(addr, addr, 1 << size);
             }
+            tcg_temp_free_i32(addr);
             stride = nregs * (1 << size);
         }
     }
-    tcg_temp_free_i32(addr);
     if (rm != 15) {
         TCGv base;