mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-11 09:56:29 +00:00
51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "opcodes.h"
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#define srnm(b,d) \
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({ \
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__asm__ volatile ( "lghi 8," #b "\n\t" \
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"srnm " #d "(8)\n\t" ::: "8"); \
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})
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unsigned
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get_rounding_mode(void)
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{
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unsigned fpc;
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__asm__ volatile ("stfpc %0\n\t" : "=m"(fpc));
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return fpc & 0x7;
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}
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int main(void)
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{
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printf("initial rounding mode = %u\n", get_rounding_mode());
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/* Set basic rounding modes in various ways */
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srnm(1,2); // 1 + 2 = 3
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printf("rounding mode = %u\n", get_rounding_mode());
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srnm(2,0);
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printf("rounding mode = %u\n", get_rounding_mode());
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srnm(0,1);
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printf("rounding mode = %u\n", get_rounding_mode());
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srnm(0,0);
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printf("rounding mode = %u\n", get_rounding_mode());
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/* Some rounding modes with bits to be ignored */
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srnm(0xff,0); // -> 3
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printf("rounding mode = %u\n", get_rounding_mode());
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srnm(0,0xfe); // -> 2
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printf("rounding mode = %u\n", get_rounding_mode());
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srnm(0xf0,0x0f); // -> 3
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printf("rounding mode = %u\n", get_rounding_mode());
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return 0;
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}
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