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[builtins] Generate __multc3 for z/OS (#77554)

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https://github.com/llvm/llvm-project/pull/68132 ended up removing
__multc3 & __divtc3 from compiler-rt library builds that have
QUAD_PRECISION but not TF_MODE due to missing int128 support. I added support for QUAD_PRECISION to
use the native hex float long double representation.

---------

Co-authored-by: Alexander Richardson <mail@alexrichardson.me>
This commit is contained in:
Sean Perry 2024-01-11 23:11:12 -05:00 committed by GitHub
parent 3baedb4111
commit cc0065a7d0
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4 changed files with 14 additions and 6 deletions
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2
compiler-rt/lib/builtins/divtc3.c
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@ -13,7 +13,7 @@
#define QUAD_PRECISION
#include "fp_lib.h"
#if defined(CRT_HAS_TF_MODE)
#if defined(CRT_HAS_F128)
// Returns: the quotient of (a + ib) / (c + id)

8
compiler-rt/lib/builtins/fp_lib.h
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@ -188,6 +188,8 @@ static __inline void wideMultiply(rep_t a, rep_t b, rep_t *hi, rep_t *lo) {
#undef Word_HiMask
#undef Word_LoMask
#undef Word_FullMask
#else
typedef long double fp_t;
#endif // defined(CRT_HAS_TF_MODE)
#else
#error SINGLE_PRECISION, DOUBLE_PRECISION or QUAD_PRECISION must be defined.
@ -374,10 +376,10 @@ static __inline fp_t __compiler_rt_fmax(fp_t x, fp_t y) {
#endif
}
#elif defined(QUAD_PRECISION) && defined(CRT_HAS_TF_MODE)
#elif defined(QUAD_PRECISION)
// The generic implementation only works for ieee754 floating point. For other
// floating point types, continue to rely on the libm implementation for now.
#if defined(CRT_HAS_IEEE_TF)
#if defined(CRT_HAS_IEEE_TF) && defined(CRT_HAS_128BIT)
static __inline tf_float __compiler_rt_logbtf(tf_float x) {
return __compiler_rt_logbX(x);
}
@ -405,6 +407,8 @@ static __inline tf_float __compiler_rt_fmaxtf(tf_float x, tf_float y) {
#define __compiler_rt_logbl crt_logbl
#define __compiler_rt_scalbnl crt_scalbnl
#define __compiler_rt_fmaxl crt_fmaxl
#define crt_fabstf crt_fabsl
#define crt_copysigntf crt_copysignl
#else
#error Unsupported TF mode type
#endif

8
compiler-rt/lib/builtins/int_types.h
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@ -189,12 +189,16 @@ typedef long double tf_float;
#define CRT_LDBL_IEEE_F128
#endif
#define TF_C(x) x##L
#elif __LDBL_MANT_DIG__ == 113
// Use long double instead of __float128 if it matches the IEEE 128-bit format.
#elif __LDBL_MANT_DIG__ == 113 || \
(__FLT_RADIX__ == 16 && __LDBL_MANT_DIG__ == 28)
// Use long double instead of __float128 if it matches the IEEE 128-bit format
// or the IBM hexadecimal format.
#define CRT_LDBL_128BIT
#define CRT_HAS_F128
#if __LDBL_MANT_DIG__ == 113
#define CRT_HAS_IEEE_TF
#define CRT_LDBL_IEEE_F128
#endif
typedef long double tf_float;
#define TF_C(x) x##L
#elif defined(__FLOAT128__) || defined(__SIZEOF_FLOAT128__)

2
compiler-rt/lib/builtins/multc3.c
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@ -15,7 +15,7 @@
#include "int_lib.h"
#include "int_math.h"
#if defined(CRT_HAS_TF_MODE)
#if defined(CRT_HAS_F128)
// Returns: the product of a + ib and c + id