Address comment.

Author: lntue

libc/test/src/math/acos_test.cpp

@@ -36,11 +36,11 @@ TEST_F(LlvmLibcAcosTest, InDoubleRange) {
 
     for (uint64_t i = 0, v = START; i <= COUNT; ++i, v += STEP) {
       double x = FPBits(v).get_val();
-      if (FPBits(v).is_nan() || FPBits(v).is_inf())
+      if (FPBits(v).is_inf_or_nan())
         continue;
       double result = LIBC_NAMESPACE::acos(x);
       ++cc;
-      if (FPBits(result).is_nan() || FPBits(result).is_inf())
+      if (FPBits(result).is_inf_or_nan())
         continue;
 
       ++count;

libc/test/src/math/smoke/CMakeLists.txt

@@ -4058,6 +4058,8 @@ add_fp_unittest(
   SRCS
     acos_test.cpp
   DEPENDS
+    libc.hdr.fenv_macros
+    libc.src.errno.errno
     libc.src.math.acos
 )
 

libc/test/src/math/smoke/acos_test.cpp

@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "hdr/fenv_macros.h"
+#include "src/errno/libc_errno.h"
 #include "src/math/acos.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
@@ -19,10 +20,20 @@ TEST_F(LlvmLibcAcosTest, SpecialNumbers) {
   EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acos(aNaN));
   EXPECT_FP_EQ(0x1.921fb54442d18p0, LIBC_NAMESPACE::acos(zero));
   EXPECT_FP_EQ(0x1.921fb54442d18p0, LIBC_NAMESPACE::acos(neg_zero));
-  EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acos(inf));
-  EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acos(neg_inf));
-  EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acos(2.0));
-  EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acos(-2.0));
+
+  LIBC_NAMESPACE::libc_errno = 0;
+  EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acos(inf),
+                                           FE_INVALID);
+  EXPECT_MATH_ERRNO(EDOM);
+  EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acos(neg_inf),
+                                           FE_INVALID);
+  EXPECT_MATH_ERRNO(EDOM);
+  EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acos(2.0),
+                                           FE_INVALID);
+  EXPECT_MATH_ERRNO(EDOM);
+  EXPECT_FP_EQ_WITH_EXCEPTION_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::acos(-2.0),
+                                           FE_INVALID);
+  EXPECT_MATH_ERRNO(EDOM);
   EXPECT_FP_EQ(zero, LIBC_NAMESPACE::acos(1.0));
   EXPECT_FP_EQ(0x1.921fb54442d18p1, LIBC_NAMESPACE::acos(-1.0));
   EXPECT_FP_EQ(0x1.921fb54442d18p0, LIBC_NAMESPACE::acos(0x1.0p-54));