[libc] Fix integer rint variants on the GPU (#98095)

Summary:
Currently these are implemented as a static cast on `__builtin_rint()`
to a long. Howver, this is not strictly correct. The standard states
that the output is unspecified, but most implementations, and the LLVM
libc implementation, do some kind of guarantee on this beahvior. This is
not guaranteed by just doing a cast. This patch just uses the generic
versions until we implement `__builitin_lrint` correctly.

Author: jhuber6

libc/src/math/amdgpu/CMakeLists.txt

@@ -456,54 +456,6 @@ add_entrypoint_object(
   VENDOR
 )
 
-add_entrypoint_object(
-  lrint
-  SRCS
-    lrint.cpp
-  HDRS
-    ../lrint.h
-  COMPILE_OPTIONS
-    ${bitcode_link_flags}
-    -O2
-  VENDOR
-)
-
-add_entrypoint_object(
-  lrintf
-  SRCS
-    lrintf.cpp
-  HDRS
-    ../lrintf.h
-  COMPILE_OPTIONS
-    ${bitcode_link_flags}
-    -O2
-  VENDOR
-)
-
-add_entrypoint_object(
-  llrint
-  SRCS
-    llrint.cpp
-  HDRS
-    ../llrint.h
-  COMPILE_OPTIONS
-    ${bitcode_link_flags}
-    -O2
-  VENDOR
-)
-
-add_entrypoint_object(
-  llrintf
-  SRCS
-    llrintf.cpp
-  HDRS
-    ../llrintf.h
-  COMPILE_OPTIONS
-    ${bitcode_link_flags}
-    -O2
-  VENDOR
-)
-
 add_entrypoint_object(
   pow
   SRCS

libc/src/math/nvptx/CMakeLists.txt

@@ -409,54 +409,6 @@ add_entrypoint_object(
   VENDOR
 )
 
-add_entrypoint_object(
-  lrint
-  SRCS
-    lrint.cpp
-  HDRS
-    ../lrint.h
-  COMPILE_OPTIONS
-    ${bitcode_link_flags}
-    -O2
-  VENDOR
-)
-
-add_entrypoint_object(
-  lrintf
-  SRCS
-    lrintf.cpp
-  HDRS
-    ../lrintf.h
-  COMPILE_OPTIONS
-    ${bitcode_link_flags}
-    -O2
-  VENDOR
-)
-
-add_entrypoint_object(
-  llrint
-  SRCS
-    llrint.cpp
-  HDRS
-    ../llrint.h
-  COMPILE_OPTIONS
-    ${bitcode_link_flags}
-    -O2
-  VENDOR
-)
-
-add_entrypoint_object(
-  llrintf
-  SRCS
-    llrintf.cpp
-  HDRS
-    ../llrintf.h
-  COMPILE_OPTIONS
-    ${bitcode_link_flags}
-    -O2
-  VENDOR
-)
-
 add_entrypoint_object(
   pow
   SRCS

libc/test/src/math/RoundToIntegerTest.h

@@ -12,6 +12,7 @@
 #include "src/__support/CPP/algorithm.h"
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/macros/properties/architectures.h"
 #include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"

libc/test/src/math/smoke/RoundToIntegerTest.h

@@ -12,7 +12,6 @@
 #include "src/__support/CPP/algorithm.h"
 #include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
-#include "src/__support/macros/properties/architectures.h"
 #include "test/UnitTest/FEnvSafeTest.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
@@ -51,12 +50,10 @@ class RoundToIntegerTestTemplate
     // 0 for errno and exceptions, but this doesn't hold for
     // all math functions using RoundToInteger test:
     // https://github.com/llvm/llvm-project/pull/88816
-#ifndef LIBC_TARGET_ARCH_IS_GPU
     if (expectError) {
       ASSERT_FP_EXCEPTION(FE_INVALID);
       ASSERT_MATH_ERRNO(EDOM);
     }
-#endif
   }
 
 public:
@@ -169,7 +166,13 @@ class RoundToIntegerTestTemplate
 #define LIST_ROUND_TO_INTEGER_TESTS(F, I, func)                                \
   LIST_ROUND_TO_INTEGER_TESTS_HELPER(F, I, func, false)
 
+// The GPU target does not support different rounding modes.
+#ifdef LIBC_TARGET_ARCH_IS_GPU
+#define LIST_ROUND_TO_INTEGER_TESTS_WITH_MODES(F, I, func)                     \
+  LIST_ROUND_TO_INTEGER_TESTS_HELPER(F, I, func, false)
+#else
 #define LIST_ROUND_TO_INTEGER_TESTS_WITH_MODES(F, I, func)                     \
   LIST_ROUND_TO_INTEGER_TESTS_HELPER(F, I, func, true)
+#endif
 
 #endif // LLVM_LIBC_TEST_SRC_MATH_SMOKE_ROUNDTOINTEGERTEST_H