0ee439b705
This patch changes types of some integer function arguments or return values from `si_int` to the default `int` type to make it more compatible with `libgcc`. The compiler-rt/lib/builtins/README.txt has a link to the [libgcc specification](http://gcc.gnu.org/onlinedocs/gccint/Libgcc.html#Libgcc). This specification has an explicit note on `int`, `float` and other such types being just illustrations in some cases while the actual types are expressed with machine modes. Such usage of always-32-bit-wide integer type may lead to issues on 16-bit platforms such as MSP430. Provided [libgcc2.h](https://gcc.gnu.org/git/?p=gcc.git;a=blob_plain;f=libgcc/libgcc2.h;hb=HEAD) can be used as a reference for all targets supported by the libgcc, this patch fixes some existing differences in helper declarations. This patch is expected to not change behavior at all for targets with 32-bit `int` type. Differential Revision: https://reviews.llvm.org/D81285
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
// RUN: %clang_builtins %s %librt -o %t && %run %t
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// REQUIRES: librt_has_popcountsi2
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#include "int_lib.h"
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#include <stdio.h>
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#include <stdlib.h>
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// Returns: count of 1 bits
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COMPILER_RT_ABI int __popcountsi2(si_int a);
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int naive_popcount(si_int a)
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{
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int r = 0;
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for (; a; a = (su_int)a >> 1)
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r += a & 1;
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return r;
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}
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int test__popcountsi2(si_int a)
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{
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si_int x = __popcountsi2(a);
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si_int expected = naive_popcount(a);
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if (x != expected)
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printf("error in __popcountsi2(0x%X) = %d, expected %d\n",
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a, x, expected);
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return x != expected;
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}
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char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
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int main()
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{
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if (test__popcountsi2(0))
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return 1;
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if (test__popcountsi2(1))
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return 1;
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if (test__popcountsi2(2))
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return 1;
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if (test__popcountsi2(0xFFFFFFFD))
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return 1;
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if (test__popcountsi2(0xFFFFFFFE))
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return 1;
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if (test__popcountsi2(0xFFFFFFFF))
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return 1;
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int i;
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for (i = 0; i < 10000; ++i)
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if (test__popcountsi2(rand()))
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return 1;
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return 0;
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}
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