910a4bf5b7
This patch implements __extendxftf2 (long double -> f128) and __trunctfxf2 (f128 -> long double) on x86_64. This is a preparation to unblock https://reviews.llvm.org/D53608, We intentionally do not modify compiler-rt/lib/builtins/fp_lib.h in this PR (in particular, to limit the scope and avoid exposing other functions on X86_64 in this PR). Instead, TODOs were added to use fp_lib.h once it is available. Test plan: 1. ninja check-compiler-rt (verified on X86_64 and on Aarch64) In particular, new tests (extendxftf2_test.c and trunctfxf2_test.c) were added. 2. compared the results of conversions with what other compilers (gcc) produce.
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
// RUN: %clang_builtins %s %librt -o %t && %run %t
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// REQUIRES: librt_has_extendsftf2
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#include "int_lib.h"
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#include <stdio.h>
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#if __LDBL_MANT_DIG__ == 113
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#include "fp_test.h"
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COMPILER_RT_ABI long double __extendsftf2(float a);
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int test__extendsftf2(float a, uint64_t expectedHi, uint64_t expectedLo)
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{
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long double x = __extendsftf2(a);
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int ret = compareResultF128(x, expectedHi, expectedLo);
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if (ret)
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{
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printf("error in test__extendsftf2(%f) = %.20Lf, "
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"expected %.20Lf\n", a, x, fromRep128(expectedHi, expectedLo));
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}
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return ret;
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}
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char assumption_1[sizeof(long double) * CHAR_BIT == 128] = {0};
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#endif
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int main()
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{
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#if __LDBL_MANT_DIG__ == 113
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// qNaN
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if (test__extendsftf2(makeQNaN32(),
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UINT64_C(0x7fff800000000000),
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UINT64_C(0x0)))
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return 1;
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// NaN
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if (test__extendsftf2(makeNaN32(UINT32_C(0x410000)),
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UINT64_C(0x7fff820000000000),
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UINT64_C(0x0)))
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return 1;
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// inf
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if (test__extendsftf2(makeInf32(),
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UINT64_C(0x7fff000000000000),
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UINT64_C(0x0)))
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return 1;
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// zero
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if (test__extendsftf2(0.0f, UINT64_C(0x0), UINT64_C(0x0)))
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return 1;
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if (test__extendsftf2(0x1.23456p+5f,
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UINT64_C(0x4004234560000000),
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UINT64_C(0x0)))
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return 1;
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if (test__extendsftf2(0x1.edcbap-9f,
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UINT64_C(0x3ff6edcba0000000),
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UINT64_C(0x0)))
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return 1;
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if (test__extendsftf2(0x1.23456p+45f,
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UINT64_C(0x402c234560000000),
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UINT64_C(0x0)))
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return 1;
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if (test__extendsftf2(0x1.edcbap-45f,
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UINT64_C(0x3fd2edcba0000000),
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UINT64_C(0x0)))
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return 1;
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#else
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printf("skipped\n");
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#endif
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return 0;
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}
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