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LoongArch: Use "$fcsr0" instead of "$r0" in _FPU_{GET,SET}CW

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Clang inline-asm parser does not allow using "$r0" in
movfcsr2gr/movgr2fcsr, so everything using _FPU_{GET,SET}CW is now
failing to build with Clang on LoongArch.  As we now requires Binutils
>= 2.41 which supports using "$fcsr0" here, use it instead of "$r0" to
fix the issue.

Link: https://github.com/loongson-community/discussions/issues/53#issuecomment-2081507390
Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=4142b2368353
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
This commit is contained in:
Xi Ruoyao 2024-04-29 15:26:24 +08:00 committed by caiyinyu
parent e0f7f1808f
commit 0c1d2c277a
1 changed files with 2 additions and 2 deletions
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4
sysdeps/loongarch/fpu_control.h
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@ -91,8 +91,8 @@ typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));
/* Macros for accessing the hardware control word. */
extern fpu_control_t __loongarch_fpu_getcw (void) __THROW;
extern void __loongarch_fpu_setcw (fpu_control_t) __THROW;
#define _FPU_GETCW(cw) __asm__ volatile ("movfcsr2gr %0,$r0" : "=r"(cw))
#define _FPU_SETCW(cw) __asm__ volatile ("movgr2fcsr $r0,%0" : : "r"(cw))
#define _FPU_GETCW(cw) __asm__ volatile ("movfcsr2gr %0,$fcsr0" : "=r"(cw))
#define _FPU_SETCW(cw) __asm__ volatile ("movgr2fcsr $fcsr0,%0" : : "r"(cw))
/* Default control word set at startup. */
extern fpu_control_t __fpu_control;