Convert sqrt functions into sqrt instructions when -ffast-math is in effect.

When -ffast-math is in effect (on Linux, at least), clang defines
__FINITE_MATH_ONLY__ > 0 when including <math.h>. This causes the
preprocessor to include <bits/math-finite.h>, which renames the sqrt functions.
For instance, "sqrt" is renamed as "__sqrt_finite". 

This patch adds the 3 new names in such a way that they will be treated
as equivalent to their respective original names.





git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182739 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/include/llvm/Target/TargetLibraryInfo.h b/include/llvm/Target/TargetLibraryInfo.h
index 5f01c8d835..4b9c0442dc 100644
--- a/include/llvm/Target/TargetLibraryInfo.h
+++ b/include/llvm/Target/TargetLibraryInfo.h
@@ -57,6 +57,12 @@ namespace llvm {
       dunder_isoc99_sscanf,
       /// void *__memcpy_chk(void *s1, const void *s2, size_t n, size_t s1size);
       memcpy_chk,
+      /// double __sqrt_finite(double x);
+      sqrt_finite,
+      /// float __sqrt_finite(float x);
+      sqrtf_finite,
+      /// long double __sqrt_finite(long double x);
+      sqrtl_finite,
       /// char * __strdup(const char *s);
       dunder_strdup,
       /// char *__strndup(const char *s, size_t n);
@@ -677,6 +683,8 @@ public:
     case LibFunc::sin:       case LibFunc::sinf:       case LibFunc::sinl:
     case LibFunc::cos:       case LibFunc::cosf:       case LibFunc::cosl:
     case LibFunc::sqrt:      case LibFunc::sqrtf:      case LibFunc::sqrtl:
+    case LibFunc::sqrt_finite: case LibFunc::sqrtf_finite:
+                                                  case LibFunc::sqrtl_finite:
     case LibFunc::floor:     case LibFunc::floorf:     case LibFunc::floorl:
     case LibFunc::nearbyint: case LibFunc::nearbyintf: case LibFunc::nearbyintl:
     case LibFunc::ceil:      case LibFunc::ceilf:      case LibFunc::ceill: