[PULL,v2,09/12] exec: Cache TARGET_PAGE_MASK for TARGET_PAGE_BITS_VARY

Message ID 20191028145937.10914-10-richard.henderson@linaro.org
State New
Headers show
Series
  • tcg patch queue
Related show

Commit Message

Richard Henderson Oct. 28, 2019, 2:59 p.m.
This eliminates a set of runtime shifts.  It turns out that we
require TARGET_PAGE_MASK more often than TARGET_PAGE_SIZE, so
redefine TARGET_PAGE_SIZE based on TARGET_PAGE_MASK instead of
the other way around.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

Reviewed-by: David Hildenbrand <david@redhat.com>

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
 include/exec/cpu-all.h | 8 ++++++--
 exec-vary.c            | 1 +
 2 files changed, 7 insertions(+), 2 deletions(-)

-- 
2.17.1

Patch

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 0543359d0f..e96781a455 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -213,6 +213,7 @@  static inline void stl_phys_notdirty(AddressSpace *as, hwaddr addr, uint32_t val
 typedef struct {
     bool decided;
     int bits;
+    target_long mask;
 } TargetPageBits;
 #if defined(CONFIG_ATTRIBUTE_ALIAS) || !defined(IN_EXEC_VARY)
 extern const TargetPageBits target_page;
@@ -221,15 +222,18 @@  extern TargetPageBits target_page;
 #endif
 #ifdef CONFIG_DEBUG_TCG
 #define TARGET_PAGE_BITS   ({ assert(target_page.decided); target_page.bits; })
+#define TARGET_PAGE_MASK   ({ assert(target_page.decided); target_page.mask; })
 #else
 #define TARGET_PAGE_BITS   target_page.bits
+#define TARGET_PAGE_MASK   target_page.mask
 #endif
+#define TARGET_PAGE_SIZE   (-(int)TARGET_PAGE_MASK)
 #else
 #define TARGET_PAGE_BITS_MIN TARGET_PAGE_BITS
+#define TARGET_PAGE_SIZE   (1 << TARGET_PAGE_BITS)
+#define TARGET_PAGE_MASK   ((target_long)-1 << TARGET_PAGE_BITS)
 #endif
 
-#define TARGET_PAGE_SIZE (1 << TARGET_PAGE_BITS)
-#define TARGET_PAGE_MASK ((target_long)-1 << TARGET_PAGE_BITS)
 #define TARGET_PAGE_ALIGN(addr) ROUND_UP((addr), TARGET_PAGE_SIZE)
 
 /* Using intptr_t ensures that qemu_*_page_mask is sign-extended even
diff --git a/exec-vary.c b/exec-vary.c
index 8725fd0285..ff905f2a8f 100644
--- a/exec-vary.c
+++ b/exec-vary.c
@@ -96,6 +96,7 @@  void finalize_target_page_bits(void)
     if (init_target_page.bits == 0) {
         init_target_page.bits = TARGET_PAGE_BITS_MIN;
     }
+    init_target_page.mask = (target_long)-1 << init_target_page.bits;
     init_target_page.decided = true;
 
     /*