target/ppc: optimize hreg_compute_pmu_hflags_value

Cache env->spr[SPR_POWER_MMCR0] in a local variable as used in multiple
conditions to avoid multiple indirect accesses.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

diff --git a/target/ppc/helper_regs.c b/target/ppc/helper_regs.c
index fe543ab3b89a454eee8889868584840a6b741251..7b23e5ef0e7dd86858d621c1bae3c85ca00e3772 100644 (file)
--- a/target/ppc/helper_regs.c
+++ b/target/ppc/helper_regs.c
@@ -83,15 +83,16 @@ static bool hreg_check_bhrb_enable(CPUPPCState *env)
 static uint32_t hreg_compute_pmu_hflags_value(CPUPPCState *env)
 {
     uint32_t hflags = 0;
-
 #if defined(TARGET_PPC64)
-    if (env->spr[SPR_POWER_MMCR0] & MMCR0_PMCC0) {
+    target_ulong mmcr0 = env->spr[SPR_POWER_MMCR0];
+
+    if (mmcr0 & MMCR0_PMCC0) {
         hflags |= 1 << HFLAGS_PMCC0;
     }
-    if (env->spr[SPR_POWER_MMCR0] & MMCR0_PMCC1) {
+    if (mmcr0 & MMCR0_PMCC1) {
         hflags |= 1 << HFLAGS_PMCC1;
     }
-    if (env->spr[SPR_POWER_MMCR0] & MMCR0_PMCjCE) {
+    if (mmcr0 & MMCR0_PMCjCE) {
         hflags |= 1 << HFLAGS_PMCJCE;
     }
     if (hreg_check_bhrb_enable(env)) {