[compiler-rt] Disable tests for unavailable builtins (#161275)

The builtins `__fixunstfdi` and `__multc3` may be removed by the
preprocessor depending on configuration flags. When this happens, the
corresponding tests fail at link time due to missing definitions.

Disable these tests when the builtins are not available.

Also remove the XFAILs for aarch64 windows. As this test now became a
no-op on platforms that lack CRT_HAS_128BIT or CRT_HAS_F128 (aarch64
windows lacks the latter), it no longer fails.

This reapplies e9e166e and
6567070 after fixing declarations of
the builtins in the tests in b542509.

rdar://159705803
rdar://159705705

---------

Co-authored-by: Martin Storsjö <[email protected]>

Author: ahatanak

compiler-rt/test/builtins/Unit/fixunstfdi_test.c

@@ -1,16 +1,14 @@
-// XFAIL: target=aarch64-{{.*}}-windows-{{.*}}
 // RUN: %clang_builtins %s %librt -o %t && %run %t
 // REQUIRES: librt_has_fixunstfdi
 
 #include <stdio.h>
+#include "int_lib.h"
 
-#if _ARCH_PPC || __aarch64__ || __arm64ec__
+#if defined(CRT_HAS_TF_MODE)
 
 #define QUAD_PRECISION
 #include "fp_lib.h"
 
-#include "int_lib.h"
-
 // Returns: convert a to a unsigned long long, rounding toward zero.
 //          Negative values all become zero.
 
@@ -38,7 +36,7 @@ char assumption_3[sizeof(fp_t)*CHAR_BIT == 128] = {0};
 
 int main()
 {
-#if _ARCH_PPC || __aarch64__ || __arm64ec__
+#if defined(CRT_HAS_TF_MODE)
     if (test__fixunstfdi(0.0, 0))
         return 1;
 

compiler-rt/test/builtins/Unit/multc3_test.c

@@ -1,15 +1,14 @@
-// XFAIL: target=aarch64-{{.*}}-windows-{{.*}}
 // RUN: %clang_builtins %s %librt -o %t && %run %t
 // REQUIRES: librt_has_multc3
 
 #include <stdio.h>
+#include "int_lib.h"
 
-#if _ARCH_PPC || __aarch64__ || __arm64ec__
+#if defined(CRT_HAS_128BIT) && defined(CRT_HAS_F128)
 
 #define QUAD_PRECISION
 #include "fp_lib.h"
 
-#include "int_lib.h"
 #include <math.h>
 #include <complex.h>
 
@@ -351,7 +350,7 @@ fp_t x[][2] =
 
 int main()
 {
-#if _ARCH_PPC || __aarch64__ || __arm64ec__
+#if defined(CRT_HAS_128BIT) && defined(CRT_HAS_F128)
     const unsigned N = sizeof(x) / sizeof(x[0]);
     unsigned i, j;
     for (i = 0; i < N; ++i)