MPILIB: disable usage of floating point registers on parisc (70ef5578) · Commits · 戴 / test

The umul_ppmm() macro for parisc uses the xmpyu assembler statement which does calculation via a floating point register. But usage of floating point registers inside the Linux kernel are not allowed and gcc will stop compilation due to the -mdisable-fpregs compiler option. Fix this by disabling the umul_ppmm() and udiv_qrnnd() macros. The mpilib will then use the generic built-in implementations instead. Signed-off-by:

Helge Deller <deller@gmx.de>

lib/mpi/longlong.h

+3 −2

Original line number	Diff line number	Diff line
		@@ -318,7 +318,8 @@ extern UDItype __udiv_qrnnd();
		"rM" ((USItype)(bh)), \
		"rM" ((USItype)(al)), \
		"rM" ((USItype)(bl)))
		#if defined(_PA_RISC1_1)
		#if 0 && defined(_PA_RISC1_1)
		/* xmpyu uses floating point register which is not allowed in Linux kernel. */
		#define umul_ppmm(wh, wl, u, v) \
		do { \
		union {UDItype __ll; \
		@@ -337,7 +338,7 @@ do { \
		#define UMUL_TIME 40
		#define UDIV_TIME 80
		#endif
		#ifndef LONGLONG_STANDALONE
		#if 0 /* #ifndef LONGLONG_STANDALONE */
		#define udiv_qrnnd(q, r, n1, n0, d) \
		do { USItype __r; \
		(q) = __udiv_qrnnd(&__r, (n1), (n0), (d)); \

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