Commit 4be27dbbde2aed1da305b83043caa6f0f0ca4309
1 parent
3a742b76
Optimize redundant cp15 coprocessor access control register writes.
Signed-off-by: Paul Brook <paul@codesourcery.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5512 c046a42c-6fe2-441c-8c8c-71466251a162
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5 additions
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3 deletions
target-arm/helper.c
| @@ -1334,9 +1334,11 @@ void HELPER(set_cp15)(CPUState *env, uint32_t insn, uint32_t val) | @@ -1334,9 +1334,11 @@ void HELPER(set_cp15)(CPUState *env, uint32_t insn, uint32_t val) | ||
| 1334 | case 2: | 1334 | case 2: |
| 1335 | if (arm_feature(env, ARM_FEATURE_XSCALE)) | 1335 | if (arm_feature(env, ARM_FEATURE_XSCALE)) |
| 1336 | goto bad_reg; | 1336 | goto bad_reg; |
| 1337 | - env->cp15.c1_coproc = val; | ||
| 1338 | - /* ??? Is this safe when called from within a TB? */ | ||
| 1339 | - tb_flush(env); | 1337 | + if (env->cp15.c1_coproc != val) { |
| 1338 | + env->cp15.c1_coproc = val; | ||
| 1339 | + /* ??? Is this safe when called from within a TB? */ | ||
| 1340 | + tb_flush(env); | ||
| 1341 | + } | ||
| 1340 | break; | 1342 | break; |
| 1341 | default: | 1343 | default: |
| 1342 | goto bad_reg; | 1344 | goto bad_reg; |