[compiler-rt] Revert "[builtins] Generate __multc3 for z/OS" (PR #77881)

[Vitaly Buka via llvm-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/77881

Reverts llvm/llvm-project#77554  because of #77880

>From 66f96e7953445486e080d8aececfdf71d5d7c4b9 Mon Sep 17 00:00:00 2001
From: Vitaly Buka <vitalybuka at gmail.com>
Date: Thu, 11 Jan 2024 23:08:52 -0800
Subject: [PATCH] Revert "[builtins] Generate __multc3 for z/OS"

---
 compiler-rt/lib/builtins/divtc3.c    | 2 +-
 compiler-rt/lib/builtins/fp_lib.h    | 8 ++------
 compiler-rt/lib/builtins/int_types.h | 8 ++------
 compiler-rt/lib/builtins/multc3.c    | 2 +-
 4 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/compiler-rt/lib/builtins/divtc3.c b/compiler-rt/lib/builtins/divtc3.c
index 099de5802daf0e..e970cef574b21d 100644
--- a/compiler-rt/lib/builtins/divtc3.c
+++ b/compiler-rt/lib/builtins/divtc3.c
@@ -13,7 +13,7 @@
 #define QUAD_PRECISION
 #include "fp_lib.h"
 
-#if defined(CRT_HAS_F128)
+#if defined(CRT_HAS_TF_MODE)
 
 // Returns: the quotient of (a + ib) / (c + id)
 
diff --git a/compiler-rt/lib/builtins/fp_lib.h b/compiler-rt/lib/builtins/fp_lib.h
index ec71b662a72f15..af406e760497a4 100644
--- a/compiler-rt/lib/builtins/fp_lib.h
+++ b/compiler-rt/lib/builtins/fp_lib.h
@@ -188,8 +188,6 @@ 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.
@@ -376,10 +374,10 @@ static __inline fp_t __compiler_rt_fmax(fp_t x, fp_t y) {
 #endif
 }
 
-#elif defined(QUAD_PRECISION)
+#elif defined(QUAD_PRECISION) && defined(CRT_HAS_TF_MODE)
 // 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) && defined(CRT_HAS_128BIT)
+#if defined(CRT_HAS_IEEE_TF)
 static __inline tf_float __compiler_rt_logbtf(tf_float x) {
   return __compiler_rt_logbX(x);
 }
@@ -407,8 +405,6 @@ 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
diff --git a/compiler-rt/lib/builtins/int_types.h b/compiler-rt/lib/builtins/int_types.h
index ca97391fc28466..7624c728061518 100644
--- a/compiler-rt/lib/builtins/int_types.h
+++ b/compiler-rt/lib/builtins/int_types.h
@@ -189,16 +189,12 @@ typedef long double tf_float;
 #define CRT_LDBL_IEEE_F128
 #endif
 #define TF_C(x) x##L
-#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.
+#elif __LDBL_MANT_DIG__ == 113
+// Use long double instead of __float128 if it matches the IEEE 128-bit 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__)
diff --git a/compiler-rt/lib/builtins/multc3.c b/compiler-rt/lib/builtins/multc3.c
index 61a3f45e47279c..f20e53ccbf233b 100644
--- a/compiler-rt/lib/builtins/multc3.c
+++ b/compiler-rt/lib/builtins/multc3.c
@@ -15,7 +15,7 @@
 #include "int_lib.h"
 #include "int_math.h"
 
-#if defined(CRT_HAS_F128)
+#if defined(CRT_HAS_TF_MODE)
 
 // Returns: the product of a + ib and c + id