[libc] Support the string conversion methods on the GPU

This patch enables us to use the existing `libc` support for string
conversion functions on the GPU. This required setting the `fenv_t` and
long double configuration. As far as I am aware, long doubles are
converted to doubles on the GPU and the floating point environment is
just an `uint32_t`.

This code is still untested as we are still working out how to run the
unit tests on the GPU.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D149306

3 files changed, 15 insertions, 0 deletions

diff --git a/libc/config/gpu/api.td b/libc/config/gpu/api.td
index 3e6927de9463..c5f555c90178 100644
--- a/libc/config/gpu/api.td
+++ b/libc/config/gpu/api.td
@@ -12,3 +12,7 @@ def StdlibAPI : PublicAPI<"stdlib.h"> {
     "__atexithandler_t",
   ];
 }
+
+def FenvAPI: PublicAPI<"fenv.h"> {
+  let Types = ["fenv_t"];
+}
diff --git a/libc/config/gpu/entrypoints.txt b/libc/config/gpu/entrypoints.txt
index c5ed1e3dd476..13d70f97363f 100644
--- a/libc/config/gpu/entrypoints.txt
+++ b/libc/config/gpu/entrypoints.txt
@@ -56,7 +56,17 @@ set(TARGET_LIBC_ENTRYPOINTS
 
     # stdlib.h entrypoints
     libc.src.stdlib.atoi
+    libc.src.stdlib.atof
+    libc.src.stdlib.atol
+    libc.src.stdlib.atoll
     libc.src.stdlib.atexit
+    libc.src.stdlib.strtod
+    libc.src.stdlib.strtof
+    libc.src.stdlib.strtol
+    libc.src.stdlib.strtold
+    libc.src.stdlib.strtoll
+    libc.src.stdlib.strtoul
+    libc.src.stdlib.strtoull
 
     # Only implemented in the test suite
     libc.src.stdlib.malloc
diff --git a/libc/config/gpu/headers.txt b/libc/config/gpu/headers.txt
index 1b77c97b00d8..608ff42cbdbc 100644
--- a/libc/config/gpu/headers.txt
+++ b/libc/config/gpu/headers.txt
@@ -1,6 +1,7 @@
 set(TARGET_PUBLIC_HEADERS
     libc.include.ctype
     libc.include.string
+    libc.include.fenv
     libc.include.errno
     libc.include.stdlib
 )