ced1bf58df
too much about them. This prevents certain peephole optimizations at -O that invalidate the tests.
198 lines
5.0 KiB
C
198 lines
5.0 KiB
C
/*
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* Copyright (c) 2005 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <machine/float.h>
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#include <string.h>
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/* Memory accesses. */
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#define Load 0x01
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#define Store 0x02
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/* Data type. */
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#define Integer 0x11
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#define FloatingPoint 0x12
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/* Data size. */
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#define Small 0x21
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#define Medium 0x22
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#define Large 0x23
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/* Post increment. */
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#define NoPostInc 0x31
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#define MinConstPostInc 0x32
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#define PlusConstPostInc 0x33
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#define ScratchRegPostInc 0x34
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#define PreservedRegPostInc 0x35
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#if ACCESS == 0 || TYPE == 0 || SIZE == 0 || POSTINC == 0
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#error define ACCESS, TYPE, SIZE and/or POSTINC
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#endif
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#if TYPE == Integer
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# define REG "r8"
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# if SIZE == Small
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# define DATA_TYPE short
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# define DATA_VALUE 0x1234
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# define LD "ld2"
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# define ST "st2"
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# elif SIZE == Medium
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# define DATA_TYPE int
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# define DATA_VALUE 0x12345678
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# define LD "ld4"
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# define ST "st4"
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# elif SIZE == Large
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# define DATA_TYPE long
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# define DATA_VALUE 0x1234567890ABCDEF
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# define LD "ld8"
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# define ST "st8"
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# endif
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#elif TYPE == FloatingPoint
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# define REG "f6"
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# if SIZE == Small
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# define DATA_TYPE float
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# define DATA_VALUE FLT_MIN
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# define LD "ldfs"
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# define ST "stfs"
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# elif SIZE == Medium
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# define DATA_TYPE double
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# define DATA_VALUE DBL_MIN
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# define LD "ldfd"
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# define ST "stfd"
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# elif SIZE == Large
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# define DATA_TYPE long double
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# define DATA_VALUE LDBL_MIN
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# define LD "ldfe"
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# define ST "stfe"
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# endif
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#endif
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struct {
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DATA_TYPE aligned;
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char _;
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char misaligned[sizeof(DATA_TYPE)];
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} data;
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DATA_TYPE *aligned = &data.aligned;
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DATA_TYPE *misaligned = (DATA_TYPE *)data.misaligned;
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DATA_TYPE value = DATA_VALUE;
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int
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main()
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{
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/* Set PSR.ac. */
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asm volatile("sum 8");
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#if ACCESS == Load
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/*
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* LOAD
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*/
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memcpy(misaligned, &value, sizeof(DATA_TYPE));
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# if POSTINC == NoPostInc
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/* Misaligned load. */
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*aligned = *misaligned;
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# elif POSTINC == MinConstPostInc
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asm volatile(
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"ld8 r2=%0;;"
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LD " " REG "=[r2],%2;;"
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"st8 %0=r2;" ST " %1=" REG ";;"
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: "=m"(misaligned), "=m"(*aligned)
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: "i"(-sizeof(DATA_TYPE))
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: REG, "r2", "memory");
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# elif POSTINC == PlusConstPostInc
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asm volatile(
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"ld8 r2=%0;;"
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LD " " REG "=[r2],%2;;"
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"st8 %0=r2;" ST " %1=" REG ";;"
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: "=m"(misaligned), "=m"(*aligned)
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: "i"(sizeof(DATA_TYPE))
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: REG, "r2", "memory");
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# elif POSTINC == ScratchRegPostInc
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asm volatile(
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"ld8 r2=%0; mov r3=%2;;"
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LD " " REG "=[r2],r3;;"
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"st8 %0=r2;" ST " %1=" REG ";;"
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: "=m"(misaligned), "=m"(*aligned)
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: "i"(sizeof(DATA_TYPE))
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: REG, "r2", "r3", "memory");
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# elif POSTINC == PreservedRegPostInc
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asm volatile(
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"ld8 r2=%0; mov r4=%2;;"
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LD " " REG "=[r2],r4;;"
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"st8 %0=r2;" ST " %1=" REG ";;"
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: "=m"(misaligned), "=m"(*aligned)
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: "i"(sizeof(DATA_TYPE))
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: REG, "r2", "r4", "memory");
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# endif
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#elif ACCESS == Store
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/*
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* STORE
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*/
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# if POSTINC == NoPostInc
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/* Misaligned store. */
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*misaligned = value;
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# elif POSTINC == MinConstPostInc
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asm volatile(
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"ld8 r2=%0;" LD " " REG "=%1;;"
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ST " [r2]=" REG ",%2;;"
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"st8 %0=r2;;"
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: "=m"(misaligned)
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: "m"(value), "i"(-sizeof(DATA_TYPE))
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: REG, "r2", "memory");
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# elif POSTINC == PlusConstPostInc
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asm volatile(
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"ld8 r2=%0;" LD " " REG "=%1;;"
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ST " [r2]=" REG ",%2;;"
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"st8 %0=r2;;"
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: "=m"(misaligned)
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: "m"(value), "i"(sizeof(DATA_TYPE))
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: REG, "r2", "memory");
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# elif POSTINC == ScratchRegPostInc || POSTINC == PreservedRegPostInc
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return (1);
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# endif
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memcpy(aligned, data.misaligned, sizeof(DATA_TYPE));
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#endif
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if (*aligned != value)
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return (2);
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#if POSTINC == NoPostInc
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return (0);
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#elif POSTINC == MinConstPostInc
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return (((char *)misaligned == data.misaligned - sizeof(DATA_TYPE))
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? 0 : 4);
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#else
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return (((char *)misaligned == data.misaligned + sizeof(DATA_TYPE))
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? 0 : 4);
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#endif
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}
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