diff mbox series

[v3,04/12] target/ppc/mem_helper.c: Remove a conditional from dcbz_common()

Message ID 20240719010707.1319675-5-richard.henderson@linaro.org
State New
Headers show
Series Fixes for user-only munmap races | expand

Commit Message

Richard Henderson July 19, 2024, 1:06 a.m. UTC 
From: BALATON Zoltan <balaton@eik.bme.hu>

Instead of passing a bool and select a value within dcbz_common() let
the callers pass in the right value to avoid this conditional
statement. On PPC dcbz is often used to zero memory and some code uses
it a lot. This change improves the run time of a test case that copies
memory with a dcbz call in every iteration from 6.23 to 5.83 seconds.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-Id: <20240622204833.5F7C74E6000@zero.eik.bme.hu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
---
 target/ppc/mem_helper.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/target/ppc/mem_helper.c b/target/ppc/mem_helper.c
index f88155ad45..361fd72226 100644
--- a/target/ppc/mem_helper.c
+++ b/target/ppc/mem_helper.c
@@ -271,12 +271,11 @@  void helper_stsw(CPUPPCState *env, target_ulong addr, uint32_t nb,
 }
 
 static void dcbz_common(CPUPPCState *env, target_ulong addr,
-                        uint32_t opcode, bool epid, uintptr_t retaddr)
+                        uint32_t opcode, int mmu_idx, uintptr_t retaddr)
 {
     target_ulong mask, dcbz_size = env->dcache_line_size;
     uint32_t i;
     void *haddr;
-    int mmu_idx = epid ? PPC_TLB_EPID_STORE : ppc_env_mmu_index(env, false);
 
 #if defined(TARGET_PPC64)
     /* Check for dcbz vs dcbzl on 970 */
@@ -309,12 +308,12 @@  static void dcbz_common(CPUPPCState *env, target_ulong addr,
 
 void helper_dcbz(CPUPPCState *env, target_ulong addr, uint32_t opcode)
 {
-    dcbz_common(env, addr, opcode, false, GETPC());
+    dcbz_common(env, addr, opcode, ppc_env_mmu_index(env, false), GETPC());
 }
 
 void helper_dcbzep(CPUPPCState *env, target_ulong addr, uint32_t opcode)
 {
-    dcbz_common(env, addr, opcode, true, GETPC());
+    dcbz_common(env, addr, opcode, PPC_TLB_EPID_STORE, GETPC());
 }
 
 void helper_icbi(CPUPPCState *env, target_ulong addr)