[libc] Enable exp10m1f on RISC-V

[mikhailramalho]

Previously, the test failed due to isnan() and isinf() not being defined.

This patch follows other tests in the same directory and calls isnan and isinf from the FBits class.

[llvmbot]

@llvm/pr-subscribers-libc

Author: Mikhail R. Gadelha (mikhailramalho)

Changes

Previously, the test failed due to isnan() and isinf() not being defined.

This patch follows other tests in the same directory and calls isnan and isinf from the FBits class.

---

Full diff: https://github.com/llvm/llvm-project/pull/138768.diff

2 Files Affected:

• (modified) libc/config/linux/riscv/entrypoints.txt (+1-1)
• (modified) libc/test/src/math/exp10m1f_test.cpp (+3-2)

diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index d2fc128b35a3c..30d9d00dfefc9 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -451,7 +451,7 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.exp
     libc.src.math.exp10
     libc.src.math.exp10f
-    # libc.src.math.exp10m1f
+    libc.src.math.exp10m1f
     libc.src.math.exp2
     libc.src.math.exp2f
     libc.src.math.exp2m1f
diff --git a/libc/test/src/math/exp10m1f_test.cpp b/libc/test/src/math/exp10m1f_test.cpp
index cc960321175cb..21076ad16268e 100644
--- a/libc/test/src/math/exp10m1f_test.cpp
+++ b/libc/test/src/math/exp10m1f_test.cpp
@@ -80,7 +80,7 @@ TEST_F(LlvmLibcExp10m1fTest, InFloatRange) {
   constexpr uint32_t STEP = UINT32_MAX / COUNT;
   for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
     float x = FPBits(v).get_val();
-    if (isnan(x) || isinf(x))
+    if (FPBits(v).is_nan() || FPBits(v).is_inf())
       continue;
     LIBC_NAMESPACE::libc_errno = 0;
     float result = LIBC_NAMESPACE::exp10m1f(x);
@@ -89,7 +89,8 @@ TEST_F(LlvmLibcExp10m1fTest, InFloatRange) {
     // in the single-precision floating point range, then ignore comparing with
     // MPFR result as MPFR can still produce valid results because of its
     // wider precision.
-    if (isnan(result) || isinf(result) || LIBC_NAMESPACE::libc_errno != 0)
+    if (FPBits(result).is_nan() || FPBits(result).is_inf() ||
+        LIBC_NAMESPACE::libc_errno != 0)
       continue;
     ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp10m1, x,
                                    LIBC_NAMESPACE::exp10m1f(x), 0.5);