[Qemu-devel] [PATCH 06/11] TCG/x86: use stack for TCG temps

[Blue Swirl]

Use stack instead of temp_buf array in CPUState for TCG
temps.

Signed-off-by: Blue Swirl <address@hidden>
---
 tcg/i386/tcg-target.c |   19 ++++++++++---------
 1 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c
index 01747f3..0e168ea 100644
--- a/tcg/i386/tcg-target.c
+++ b/tcg/i386/tcg-target.c
@@ -1918,19 +1918,22 @@ static void tcg_target_qemu_prologue(TCGContext *s)

     /* TB prologue */

-    /* Save all callee saved registers.  */
-    for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {
-        tcg_out_push(s, tcg_target_callee_save_regs[i]);
-    }
-
-    /* Reserve some stack space.  */
+    /* Reserve some stack space, also for TCG temps.  */
     push_size = 1 + ARRAY_SIZE(tcg_target_callee_save_regs);
     push_size *= TCG_TARGET_REG_BITS / 8;

-    frame_size = push_size + TCG_STATIC_CALL_ARGS_SIZE;
+    frame_size = push_size + TCG_STATIC_CALL_ARGS_SIZE +
+        CPU_TEMP_BUF_NLONGS * sizeof(long);
     frame_size = (frame_size + TCG_TARGET_STACK_ALIGN - 1) &
         ~(TCG_TARGET_STACK_ALIGN - 1);
     stack_addend = frame_size - push_size;
+    tcg_set_frame(s, TCG_REG_ESP, 0, CPU_TEMP_BUF_NLONGS * sizeof(long));
+
+    /* Save all callee saved registers.  */
+    for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {
+        tcg_out_push(s, tcg_target_callee_save_regs[i]);
+    }
+
     tcg_out_addi(s, TCG_REG_ESP, -stack_addend);

     /* jmp *tb.  */
@@ -1979,6 +1982,4 @@ static void tcg_target_init(TCGContext *s)
     tcg_regset_set_reg(s->reserved_regs, TCG_REG_ESP);

     tcg_add_target_add_op_defs(x86_op_defs);
-    tcg_set_frame(s, TCG_AREG0, offsetof(CPUState, temp_buf),
-                  CPU_TEMP_BUF_NLONGS * sizeof(long));
 }
-- 
1.6.2.4

0006-TCG-x86-use-stack-for-TCG-temps.patch
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