DC ZVA instruction can't execute by CPU Cortex-A78

Hi All, Currently, I'm working on linux kernel bootup task on "Arm-A78" CPU. Linux kernel version : linux-kernel5.10.39. Uboot version : U-Boot 2021.10-rc2 Currently, Uboot is execute successfully...
DC ZVA instruction can't execute by CPU Cortex-A78

Hi All, Currently, I'm working on linux kernel bootup task on "Arm-A78" CPU. Linux kernel version : linux-kernel5.10.39. Uboot version : U-Boot 2021.10-rc2 Currently, Uboot is execute successfully...
Compiler doesn't implement "Conditional Execution Instruction" (e.g. SUBS). Why ?

Hello, In the excellent textbook ARM System Developer's Guide: Designing and Optimizing System Software (Andrew N. Sloss, Dominic Symes, Chris Wright - Elsevier, 2004) there is example on the page 115...
Compiler doesn't implement "Conditional Execution Instruction" (e.g. SUBS). Why ?

Hello, In the excellent textbook ARM System Developer's Guide: Designing and Optimizing System Software (Andrew N. Sloss, Dominic Symes, Chris Wright - Elsevier, 2004) there is example on the page 115...
casal instruction is slower than ldxr/stlxr in glibc atomic_compare_exhchange

I find the cas instruction is more slower than ldxr/stlxr, i have test it with __atomic_compare_exchange time_cnt_old = get_cnt(); for (k = 0 ; k < LOOP_CNT; k++) { countold=count; count++;...