diff mbox series

[PULL,68/72] target/ppc/mmu-hash32.c: Drop a local variable

Message ID 20240523230747.45703-69-npiggin@gmail.com (mailing list archive)
State New, archived
Headers show
Series [PULL,01/72] spapr: avoid overhead of finding vhyp class in critical operations | expand

Commit Message

Nicholas Piggin May 23, 2024, 11:07 p.m. UTC 
From: BALATON Zoltan <balaton@eik.bme.hu>

In ppc_hash32_xlate() the value of need_prop is checked in two places
but precalculating it does not help because when we reach the first
check we always return and not reach the second place so the value
will only be used once. We can drop the local variable and calculate
it when needed, which makes these checks using it similar to other
places with such checks.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 target/ppc/mmu-hash32.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/target/ppc/mmu-hash32.c b/target/ppc/mmu-hash32.c
index da6e8b293c..3abaf16e78 100644
--- a/target/ppc/mmu-hash32.c
+++ b/target/ppc/mmu-hash32.c
@@ -386,7 +386,6 @@  bool ppc_hash32_xlate(PowerPCCPU *cpu, vaddr eaddr, MMUAccessType access_type,
     hwaddr pte_offset;
     ppc_hash_pte32_t pte;
     int prot;
-    int need_prot;
     hwaddr raddr;
 
     /* There are no hash32 large pages. */
@@ -400,13 +399,11 @@  bool ppc_hash32_xlate(PowerPCCPU *cpu, vaddr eaddr, MMUAccessType access_type,
         return true;
     }
 
-    need_prot = prot_for_access_type(access_type);
-
     /* 2. Check Block Address Translation entries (BATs) */
     if (env->nb_BATs != 0) {
         raddr = ppc_hash32_bat_lookup(cpu, eaddr, access_type, protp, mmu_idx);
         if (raddr != -1) {
-            if (need_prot & ~*protp) {
+            if (prot_for_access_type(access_type) & ~*protp) {
                 if (guest_visible) {
                     if (access_type == MMU_INST_FETCH) {
                         cs->exception_index = POWERPC_EXCP_ISI;
@@ -474,7 +471,7 @@  bool ppc_hash32_xlate(PowerPCCPU *cpu, vaddr eaddr, MMUAccessType access_type,
 
     prot = ppc_hash32_pte_prot(mmu_idx, sr, pte);
 
-    if (need_prot & ~prot) {
+    if (prot_for_access_type(access_type) & ~prot) {
         /* Access right violation */
         qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n");
         if (guest_visible) {