On Thu, Mar 18, 2010 at 06:35:21PM -0700, Tony Lindgren wrote: > -#if defined(CONFIG_HAS_TLS_REG) > - mcr p15, 0, r3, c13, c0, 3 @ set TLS register > -#elif !defined(CONFIG_TLS_REG_EMUL) > - mov r4, #0xffff0fff > - str r3, [r4, #-15] @ TLS val at 0xffff0ff0 > +#if !defined(CONFIG_TLS_REG_EMUL) > + ldr r4, =elf_hwcap > + ldr r4, [r4, #0] > + tst r4, #HWCAP_TLS @ hardware with TLS?
This is really really inefficient. Both the second ldr and tst will stall the pipeline because they need to wait for the result of the precending ldr. Can we do better by re-ordering some instructions? Also, the ifndef seems incorrect - if we have TLS_REG_EMUL we seem to omit all this code. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
