add differential pointer return c test

enzyme/functional_tests_c/differential_pointer_return.c

@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <assert.h>
+#define __builtin_autodiff __enzyme_autodiff
+double __enzyme_autodiff(void*, ...);
+
+double f_read(double* x) {
+  double product = (*x) * (*x);
+  return product;
+}
+
+double* g_write(double* x, double product) {
+  *x = (*x) * product;
+  return x;
+}
+
+double h_read(double* x) {
+  return *x;
+}
+
+double readwriteread_helper(double* x) {
+  double product = f_read(x);
+  x = g_write(x, product);
+  double ret = h_read(x);
+  return ret; 
+}
+
+void readwriteread(double*__restrict x, double*__restrict ret) {
+  *ret = readwriteread_helper(x);
+}
+
+int main(int argc, char** argv) {
+  double ret = 0;
+  double dret = 1.0;
+  double* x = (double*) malloc(sizeof(double));
+  double* dx = (double*) malloc(sizeof(double));
+  *x = 2.0;
+  *dx = 0.0;
+
+  __builtin_autodiff(readwriteread, x, dx, &ret, &dret);
+
+
+  printf("dx is %f ret is %f\n", *dx, ret);
+  assert(*dx == 3*2.0*2.0);
+  return 0;
+}

enzyme/functional_tests_c/testfiles/differential_pointer_return-enzyme0.test

@@ -0,0 +1,6 @@
+; RUN: cd %desired_wd
+; RUN: make clean-differential_pointer_return-enzyme0 ENZYME_PLUGIN=%loadEnzyme
+; RUN: make build/differential_pointer_return-enzyme0 ENZYME_PLUGIN=%loadEnzyme CLANG_BIN_PATH=%clangBinPath
+; RUN: build/differential_pointer_return-enzyme0
+; RUN: make clean-differential_pointer_return-enzyme0 ENZYME_PLUGIN=%loadEnzyme
+

enzyme/functional_tests_c/testfiles/differential_pointer_return-enzyme1.test

@@ -0,0 +1,6 @@
+; RUN: cd %desired_wd
+; RUN: make clean-differential_pointer_return-enzyme1 ENZYME_PLUGIN=%loadEnzyme
+; RUN: make build/differential_pointer_return-enzyme1 ENZYME_PLUGIN=%loadEnzyme CLANG_BIN_PATH=%clangBinPath
+; RUN: build/differential_pointer_return-enzyme1
+; RUN: make clean-differential_pointer_return-enzyme1 ENZYME_PLUGIN=%loadEnzyme
+

enzyme/functional_tests_c/testfiles/differential_pointer_return-enzyme2.test

@@ -0,0 +1,6 @@
+; RUN: cd %desired_wd
+; RUN: make clean-differential_pointer_return-enzyme2 ENZYME_PLUGIN=%loadEnzyme
+; RUN: make build/differential_pointer_return-enzyme2 ENZYME_PLUGIN=%loadEnzyme CLANG_BIN_PATH=%clangBinPath
+; RUN: build/differential_pointer_return-enzyme2
+; RUN: make clean-differential_pointer_return-enzyme2 ENZYME_PLUGIN=%loadEnzyme
+

enzyme/functional_tests_c/testfiles/differential_pointer_return-enzyme3.test

@@ -0,0 +1,6 @@
+; RUN: cd %desired_wd
+; RUN: make clean-differential_pointer_return-enzyme3 ENZYME_PLUGIN=%loadEnzyme
+; RUN: make build/differential_pointer_return-enzyme3 ENZYME_PLUGIN=%loadEnzyme CLANG_BIN_PATH=%clangBinPath
+; RUN: build/differential_pointer_return-enzyme3
+; RUN: make clean-differential_pointer_return-enzyme3 ENZYME_PLUGIN=%loadEnzyme
+