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cpu/msp430: aid optimizer

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Declare functions retrieving the clock domains frequency as pure so
that common subexpressions can be eliminated more easily.
This commit is contained in:
Marian Buschsieweke 2023-12-06 20:35:19 +01:00
parent 7044699388
commit e6154a04a1
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GPG Key ID: 77AA882EC78084E6
2 changed files with 5 additions and 4 deletions
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5
cpu/msp430/clock.c
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@ -348,7 +348,8 @@ void default_clock_init(void)
__attribute__((weak, alias("default_clock_init"))) void clock_init(void); __attribute__((weak, alias("default_clock_init"))) void clock_init(void);
uint32_t msp430_submain_clock_freq(void) { uint32_t PURE msp430_submain_clock_freq(void)
{
uint16_t shift = (clock_params.submain_clock_divier >> 1) & 0x3; uint16_t shift = (clock_params.submain_clock_divier >> 1) & 0x3;
switch (clock_params.submain_clock_source) { switch (clock_params.submain_clock_source) {
case SUBMAIN_CLOCK_SOURCE_LFXT1CLK: case SUBMAIN_CLOCK_SOURCE_LFXT1CLK:
@ -365,7 +366,7 @@ uint32_t msp430_submain_clock_freq(void) {
} }
} }
uint32_t msp430_auxiliary_clock_freq(void) uint32_t PURE msp430_auxiliary_clock_freq(void)
{ {
uint16_t shift = (clock_params.auxiliary_clock_divier >> 4) & 0x3; uint16_t shift = (clock_params.auxiliary_clock_divier >> 4) & 0x3;
return clock_params.lfxt1_frequency >> shift; return clock_params.lfxt1_frequency >> shift;

4
cpu/msp430/include/periph_cpu_common.h
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@ -358,14 +358,14 @@ void clock_init(void);
* *
* @note This is only useful when implementing MSP430 peripheral drivers * @note This is only useful when implementing MSP430 peripheral drivers
*/ */
uint32_t msp430_submain_clock_freq(void); uint32_t PURE msp430_submain_clock_freq(void);
/** /**
* @brief Get the configured auxiliary clock frequency * @brief Get the configured auxiliary clock frequency
* *
* @note This is only useful when implementing MSP430 peripheral drivers * @note This is only useful when implementing MSP430 peripheral drivers
*/ */
uint32_t msp430_auxiliary_clock_freq(void); uint32_t PURE msp430_auxiliary_clock_freq(void);
#ifdef __cplusplus #ifdef __cplusplus
} }