19e6c50d2d
helper_shilo has not been shifting an accumulator value correctly for negative values in 'shift' field. Minor optimization for shift=0 case. This change also adds tests that will trigger issue and check for regressions. Signed-off-by: Petar Jovanovic <petarj@mips.com> Reviewed-by: Richard Henderson <rth@twiddle.net> Reviewed-by: Eric Johnson <ericj@mips.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
46 lines
799 B
C
46 lines
799 B
C
#include<stdio.h>
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#include<assert.h>
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int main()
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{
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int ach, acl;
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int resulth, resultl;
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ach = 0xBBAACCFF;
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acl = 0x1C3B001D;
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resulth = 0x17755;
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resultl = 0x99fe3876;
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__asm
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("mthi %0, $ac1\n\t"
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"mtlo %1, $ac1\n\t"
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"shilo $ac1, 0x0F\n\t"
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"mfhi %0, $ac1\n\t"
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"mflo %1, $ac1\n\t"
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: "+r"(ach), "+r"(acl)
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);
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assert(ach == resulth);
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assert(acl == resultl);
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ach = 0x1;
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acl = 0x80000000;
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resulth = 0x3;
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resultl = 0x0;
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__asm
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("mthi %0, $ac1\n\t"
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"mtlo %1, $ac1\n\t"
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"shilo $ac1, -1\n\t"
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"mfhi %0, $ac1\n\t"
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"mflo %1, $ac1\n\t"
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: "+r"(ach), "+r"(acl)
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);
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assert(ach == resulth);
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assert(acl == resultl);
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return 0;
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}
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