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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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347b0cf022
The following asm statements generated a sparse warning:
asm("addcc \n\t" : "=r" (((USItype)(r2)))
warning: asm output is not an lvalue
When asking on the sparse mailing list Linus replyed:
"
Those casts to (USItype) are all pointless to begin with (since the
values are of that type already!) and they mean that the expression
isn't something you can assign to (lvalue).
"
In the math emulation code drop all casts in the output
parts of the asm statements.
This fixes a lot of "warning: asm output is not an lvalue" sparse
warnings in math_32.c.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
116 lines
3.7 KiB
C
116 lines
3.7 KiB
C
#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
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__asm__ ("addcc %r4,%5,%1\n\t" \
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"addx %r2,%3,%0\n" \
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: "=r" (sh), \
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"=&r" (sl) \
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: "%rJ" ((USItype)(ah)), \
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"rI" ((USItype)(bh)), \
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"%rJ" ((USItype)(al)), \
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"rI" ((USItype)(bl)) \
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: "cc")
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#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
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__asm__ ("subcc %r4,%5,%1\n\t" \
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"subx %r2,%3,%0\n" \
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: "=r" (sh), \
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"=&r" (sl) \
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: "rJ" ((USItype)(ah)), \
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"rI" ((USItype)(bh)), \
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"rJ" ((USItype)(al)), \
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"rI" ((USItype)(bl)) \
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: "cc")
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#define umul_ppmm(w1, w0, u, v) \
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__asm__ ("! Inlined umul_ppmm\n\t" \
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"wr %%g0,%2,%%y ! SPARC has 0-3 delay insn after a wr\n\t" \
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"sra %3,31,%%g2 ! Don't move this insn\n\t" \
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"and %2,%%g2,%%g2 ! Don't move this insn\n\t" \
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"andcc %%g0,0,%%g1 ! Don't move this insn\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,%3,%%g1\n\t" \
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"mulscc %%g1,0,%%g1\n\t" \
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"add %%g1,%%g2,%0\n\t" \
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"rd %%y,%1\n" \
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: "=r" (w1), \
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"=r" (w0) \
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: "%rI" ((USItype)(u)), \
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"r" ((USItype)(v)) \
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: "%g1", "%g2", "cc")
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/* It's quite necessary to add this much assembler for the sparc.
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The default udiv_qrnnd (in C) is more than 10 times slower! */
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#define udiv_qrnnd(q, r, n1, n0, d) \
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__asm__ ("! Inlined udiv_qrnnd\n\t" \
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"mov 32,%%g1\n\t" \
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"subcc %1,%2,%%g0\n\t" \
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"1: bcs 5f\n\t" \
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"addxcc %0,%0,%0 ! shift n1n0 and a q-bit in lsb\n\t" \
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"sub %1,%2,%1 ! this kills msb of n\n\t" \
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"addx %1,%1,%1 ! so this can't give carry\n\t" \
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"subcc %%g1,1,%%g1\n\t" \
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"2: bne 1b\n\t" \
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"subcc %1,%2,%%g0\n\t" \
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"bcs 3f\n\t" \
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"addxcc %0,%0,%0 ! shift n1n0 and a q-bit in lsb\n\t" \
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"b 3f\n\t" \
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"sub %1,%2,%1 ! this kills msb of n\n\t" \
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"4: sub %1,%2,%1\n\t" \
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"5: addxcc %1,%1,%1\n\t" \
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"bcc 2b\n\t" \
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"subcc %%g1,1,%%g1\n\t" \
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"! Got carry from n. Subtract next step to cancel this carry.\n\t" \
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"bne 4b\n\t" \
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"addcc %0,%0,%0 ! shift n1n0 and a 0-bit in lsb\n\t" \
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"sub %1,%2,%1\n\t" \
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"3: xnor %0,0,%0\n\t" \
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"! End of inline udiv_qrnnd\n" \
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: "=&r" (q), \
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"=&r" (r) \
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: "r" ((USItype)(d)), \
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"1" ((USItype)(n1)), \
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"0" ((USItype)(n0)) : "%g1", "cc")
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#define UDIV_NEEDS_NORMALIZATION 0
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#define abort() \
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return 0
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#ifdef __BIG_ENDIAN
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#define __BYTE_ORDER __BIG_ENDIAN
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#else
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#define __BYTE_ORDER __LITTLE_ENDIAN
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#endif
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