diff options
| author | Marti Bolivar <mbolivar@leaflabs.com> | 2012-08-22 17:04:23 -0400 |
|---|---|---|
| committer | Marti Bolivar <mbolivar@leaflabs.com> | 2012-08-22 17:05:04 -0400 |
| commit | e8c974423cacae739292c65cd923c0f23b9ee1a3 (patch) | |
| tree | f72e3deecbe9680c3118dd92c5e9baae9b8dbba5 /libmaple/include | |
| parent | 64e8a234bfbfbf0569fc8522576f58f4c41d6b16 (diff) | |
Revert "Re-work the constraints on delay_us(). Ask GCC to allocate a register"
This reverts commit 715a63dccb3a39d7d0502fb39b900c8302a60a87. It fails
to build using the 2010 CodeSourcery toolchain, which is still the latest
officially supported version.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
Diffstat (limited to 'libmaple/include')
| -rw-r--r-- | libmaple/include/libmaple/delay.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/libmaple/include/libmaple/delay.h b/libmaple/include/libmaple/delay.h index fbe7d1b..472a208 100644 --- a/libmaple/include/libmaple/delay.h +++ b/libmaple/include/libmaple/delay.h @@ -50,12 +50,12 @@ static inline void delay_us(uint32 us) { /* fudge for function call overhead */ us--; - asm volatile("1: subs %[us], #1 \n\t" + asm volatile(" mov r0, %[us] \n\t" + "1: subs r0, #1 \n\t" " bhi 1b \n\t" - : [us] "=r" (us) - : "[us]" (us) : - ); + : [us] "r" (us) + : "r0"); } #ifdef __cplusplus |