Improve generated code for various libgcc2.c routines
libgcc/ * libgcc2.c (__addvSI3): Use overflow builtins. (__addvsi3, __addvDI3 ,__subvSI3, __subvsi3): Likewise. (__subvDI3 __mulvSI3, __mulvsi3, __negvSI2): Likewise. (__negvsi2, __negvDI2): Likewise. (__cmpdi2, __ucmpdi2): Adjust implementation to improve generated code. * libgcc2.h (__ucmpdi2): Adjust prototype.
This commit is contained in:
Stefan Kanthak
Jeff Law
parent
cf392dbdf1
commit
ebc4cd54b2
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@ -75,9 +75,9 @@ __negdi2 (DWtype u)
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Wtype
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__addvSI3 (Wtype a, Wtype b)
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{
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const Wtype w = (UWtype) a + (UWtype) b;
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Wtype w;
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if (b >= 0 ? w < a : w > a)
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if (__builtin_add_overflow(a, b, &w))
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abort ();
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return w;
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@ -86,9 +86,9 @@ __addvSI3 (Wtype a, Wtype b)
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SItype
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__addvsi3 (SItype a, SItype b)
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{
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const SItype w = (USItype) a + (USItype) b;
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SItype w;
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if (b >= 0 ? w < a : w > a)
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if (__builtin_add_overflow(a, b, &w))
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abort ();
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return w;
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@ -100,9 +100,9 @@ __addvsi3 (SItype a, SItype b)
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DWtype
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__addvDI3 (DWtype a, DWtype b)
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{
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const DWtype w = (UDWtype) a + (UDWtype) b;
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DWtype w;
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if (b >= 0 ? w < a : w > a)
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if (__builtin_add_overflow(a, b, &w))
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abort ();
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return w;
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@ -113,9 +113,9 @@ __addvDI3 (DWtype a, DWtype b)
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Wtype
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__subvSI3 (Wtype a, Wtype b)
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{
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const Wtype w = (UWtype) a - (UWtype) b;
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Wtype w;
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if (b >= 0 ? w > a : w < a)
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if (__builtin_sub_overflow(a, b, &w))
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abort ();
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return w;
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@ -124,9 +124,9 @@ __subvSI3 (Wtype a, Wtype b)
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SItype
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__subvsi3 (SItype a, SItype b)
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{
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const SItype w = (USItype) a - (USItype) b;
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SItype w;
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if (b >= 0 ? w > a : w < a)
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if (__builtin_sub_overflow(a, b, &w))
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abort ();
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return w;
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@ -138,9 +138,9 @@ __subvsi3 (SItype a, SItype b)
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DWtype
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__subvDI3 (DWtype a, DWtype b)
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{
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const DWtype w = (UDWtype) a - (UDWtype) b;
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DWtype w;
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if (b >= 0 ? w > a : w < a)
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if (__builtin_sub_overflow(a, b, &w))
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abort ();
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return w;
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@ -151,22 +151,20 @@ __subvDI3 (DWtype a, DWtype b)
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Wtype
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__mulvSI3 (Wtype a, Wtype b)
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{
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const DWtype w = (DWtype) a * (DWtype) b;
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Wtype w;
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if ((Wtype) (w >> W_TYPE_SIZE) != (Wtype) w >> (W_TYPE_SIZE - 1))
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if (__builtin_mul_overflow(a, b, &w))
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abort ();
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return w;
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}
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#ifdef COMPAT_SIMODE_TRAPPING_ARITHMETIC
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#undef WORD_SIZE
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#define WORD_SIZE (sizeof (SItype) * __CHAR_BIT__)
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SItype
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__mulvsi3 (SItype a, SItype b)
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{
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const DItype w = (DItype) a * (DItype) b;
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SItype w;
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if ((SItype) (w >> WORD_SIZE) != (SItype) w >> (WORD_SIZE-1))
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if (__builtin_mul_overflow(a, b, &w))
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abort ();
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return w;
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@ -178,23 +176,23 @@ __mulvsi3 (SItype a, SItype b)
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Wtype
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__negvSI2 (Wtype a)
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{
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const Wtype w = -(UWtype) a;
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Wtype w;
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if (a >= 0 ? w > 0 : w < 0)
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if (__builtin_sub_overflow(0, a, &w))
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abort ();
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return w;
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return w;
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}
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#ifdef COMPAT_SIMODE_TRAPPING_ARITHMETIC
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SItype
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__negvsi2 (SItype a)
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{
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const SItype w = -(USItype) a;
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SItype w;
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if (a >= 0 ? w > 0 : w < 0)
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if (__builtin_sub_overflow(0, a, &w))
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abort ();
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return w;
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return w;
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}
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#endif /* COMPAT_SIMODE_TRAPPING_ARITHMETIC */
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#endif
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@ -203,9 +201,9 @@ __negvsi2 (SItype a)
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DWtype
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__negvDI2 (DWtype a)
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{
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const DWtype w = -(UDWtype) a;
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DWtype w;
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if (a >= 0 ? w > 0 : w < 0)
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if (__builtin_sub_overflow(0, a, &w))
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abort ();
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return w;
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@ -953,7 +951,7 @@ __udivmoddi4 (UDWtype n, UDWtype d, UDWtype *rp)
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aligns the divisor under the dividend and then perform number of
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test-subtract iterations which shift the dividend left. Number of
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iterations is k + 1 where k is the number of bit positions the
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divisor must be shifted left to align it under the dividend.
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divisor must be shifted left to align it under the dividend.
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quotient bits can be saved in the rightmost positions of the dividend
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as it shifts left on each test-subtract iteration. */
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@ -965,7 +963,7 @@ __udivmoddi4 (UDWtype n, UDWtype d, UDWtype *rp)
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k = lz1 - lz2;
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y = (y << k);
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/* Dividend can exceed 2 ^ (width − 1) − 1 but still be less than the
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/* Dividend can exceed 2 ^ (width - 1) - 1 but still be less than the
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aligned divisor. Normal iteration can drops the high order bit
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of the dividend. Therefore, first test-subtract iteration is a
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special case, saving its quotient bit in a separate location and
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@ -1325,37 +1323,15 @@ __udivdi3 (UDWtype n, UDWtype d)
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cmp_return_type
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__cmpdi2 (DWtype a, DWtype b)
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{
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const DWunion au = {.ll = a};
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const DWunion bu = {.ll = b};
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if (au.s.high < bu.s.high)
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return 0;
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else if (au.s.high > bu.s.high)
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return 2;
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if ((UWtype) au.s.low < (UWtype) bu.s.low)
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return 0;
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else if ((UWtype) au.s.low > (UWtype) bu.s.low)
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return 2;
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return 1;
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return (a > b) - (a < b) + 1;
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}
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#endif
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#ifdef L_ucmpdi2
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cmp_return_type
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__ucmpdi2 (DWtype a, DWtype b)
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__ucmpdi2 (UDWtype a, UDWtype b)
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{
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const DWunion au = {.ll = a};
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const DWunion bu = {.ll = b};
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if ((UWtype) au.s.high < (UWtype) bu.s.high)
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return 0;
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else if ((UWtype) au.s.high > (UWtype) bu.s.high)
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return 2;
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if ((UWtype) au.s.low < (UWtype) bu.s.low)
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return 0;
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else if ((UWtype) au.s.low > (UWtype) bu.s.low)
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return 2;
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return 1;
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return (a > b) - (a < b) + 1;
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}
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#endif
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@ -402,7 +402,7 @@ extern UWtype __udiv_w_sdiv (UWtype *, UWtype, UWtype, UWtype);
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#endif
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extern cmp_return_type __cmpdi2 (DWtype, DWtype);
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extern cmp_return_type __ucmpdi2 (DWtype, DWtype);
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extern cmp_return_type __ucmpdi2 (UDWtype, UDWtype);
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#if MIN_UNITS_PER_WORD > 1
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extern SItype __bswapsi2 (SItype);
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