[libc] Initialize rand for fma tests (#88055)
Summary:
The GPU build will have some random garbage here since we do not support
initializers for the underlying implementation. Manually set the seed to
1.
diff --git a/libc/test/src/math/CMakeLists.txt b/libc/test/src/math/CMakeLists.txt
index 274018e..5511986 100644
--- a/libc/test/src/math/CMakeLists.txt
+++ b/libc/test/src/math/CMakeLists.txt
@@ -1271,6 +1271,7 @@
DEPENDS
libc.src.math.fmaf
libc.src.stdlib.rand
+ libc.src.stdlib.srand
libc.src.__support.FPUtil.fp_bits
FLAGS
FMA_OPT__ONLY
@@ -1286,6 +1287,7 @@
DEPENDS
libc.src.math.fma
libc.src.stdlib.rand
+ libc.src.stdlib.srand
libc.src.__support.FPUtil.fp_bits
)
diff --git a/libc/test/src/math/FmaTest.h b/libc/test/src/math/FmaTest.h
index a3b1c9b..76bd221 100644
--- a/libc/test/src/math/FmaTest.h
+++ b/libc/test/src/math/FmaTest.h
@@ -11,6 +11,7 @@
#include "src/__support/FPUtil/FPBits.h"
#include "src/stdlib/rand.h"
+#include "src/stdlib/srand.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
@@ -76,6 +77,7 @@
void test_subnormal_range(Func func) {
constexpr StorageType COUNT = 100'001;
constexpr StorageType STEP = (MAX_SUBNORMAL - MIN_SUBNORMAL) / COUNT;
+ LIBC_NAMESPACE::srand(1);
for (StorageType v = MIN_SUBNORMAL, w = MAX_SUBNORMAL;
v <= MAX_SUBNORMAL && w >= MIN_SUBNORMAL; v += STEP, w -= STEP) {
T x = FPBits(get_random_bit_pattern()).get_val(), y = FPBits(v).get_val(),
@@ -89,6 +91,7 @@
void test_normal_range(Func func) {
constexpr StorageType COUNT = 100'001;
constexpr StorageType STEP = (MAX_NORMAL - MIN_NORMAL) / COUNT;
+ LIBC_NAMESPACE::srand(1);
for (StorageType v = MIN_NORMAL, w = MAX_NORMAL;
v <= MAX_NORMAL && w >= MIN_NORMAL; v += STEP, w -= STEP) {
T x = FPBits(v).get_val(), y = FPBits(w).get_val(),
