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math: fix failing test on FreeBSD with gcc 12.2.0 (and -ffast-math) (#19278)
This commit is contained in:
Delyan Angelov
GitHub
parent
639f128c1b
commit
3e93a13ed8
32
.cirrus.yml
32
.cirrus.yml
@ -1,19 +1,35 @@
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env:
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CIRRUS_CLONE_DEPTH: 1
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LANG: en_US.UTF-8
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freebsd_instance:
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image_family: freebsd-13-0
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freebsd_task:
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name: Code CI / freebsd
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name: FreeBSD Code CI
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timeout_in: 31m
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skip: "!changesInclude('.cirrus.yml', '**.{v,vsh}')"
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install_script: pkg install -y git
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script: |
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echo 'Building V'
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git clone https://github.com/vlang/v
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cd v
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make
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diagnose_env_script: |
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## env ## CIRRUS_WORKING_DIR is /tmp/cirrus-ci-build
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pwd
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ls -la
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whoami
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git log -n1
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echo 'number of detected processors:'
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getconf _NPROCESSORS_ONLN
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build_script: |
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echo 'Building local V'
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cc --version
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make CFLAGS=
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build_fast_script: |
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##.github/workflows/freebsd_build_tcc.sh
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##tcc -v -v
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echo 'Build cmd/tools/fast'
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cd cmd/tools/fast && ../../../v fast.v && ./fast -clang
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cd cmd/tools/fast && ../../../v fast.v ## && ./fast -clang
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diagnose_math_script: |
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echo 'Diagnose vlib/math/math_test.v'
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./v -stats vlib/math/math_test.v
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test_self_script: |
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echo 'Run test-self'
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cd /tmp/cirrus-ci-build/v
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VTEST_JUST_ESSENTIAL=1 ./v test-self
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@ -29,6 +29,11 @@ pub fn nan() f64 {
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// is_nan reports whether f is an IEEE 754 ``not-a-number'' value.
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pub fn is_nan(f f64) bool {
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$if fast_math {
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if f64_bits(f) == math.uvnan {
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return true
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}
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}
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// IEEE 754 says that only NaNs satisfy f != f.
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// To avoid the floating-point hardware, could use:
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// x := f64_bits(f);
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@ -140,6 +140,7 @@ pub fn clamp(x f64, a f64, b f64) f64 {
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// if n is not a number, its sign is nan too.
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[inline]
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pub fn sign(n f64) f64 {
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// dump(n)
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if is_nan(n) {
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return nan()
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}
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@ -200,9 +201,21 @@ pub fn veryclose(a f64, b f64) bool {
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// alike checks if a and b are equal
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pub fn alike(a f64, b f64) bool {
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// eprintln('>>> a: ${f64_bits(a):20} | b: ${f64_bits(b):20} | a==b: ${a == b} | a: ${a:10} | b: ${b:10}')
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// compare a and b, ignoring their last 2 bits:
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if f64_bits(a) & 0xFFFF_FFFF_FFFF_FFFC == f64_bits(b) & 0xFFFF_FFFF_FFFF_FFFC {
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return true
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}
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if a == -0 && b == 0 {
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return true
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}
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if a == 0 && b == -0 {
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return true
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}
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if is_nan(a) && is_nan(b) {
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return true
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} else if a == b {
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}
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if a == b {
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return signbit(a) == signbit(b)
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}
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return false
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@ -216,6 +216,11 @@ fn soclose(a f64, b f64, e_ f64) bool {
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}
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fn test_nan() {
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$if fast_math {
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println('>> skipping ${@METHOD} with -fast-math')
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return
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}
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// Note: these assertions do fail with `-cc gcc -cflags -ffast-math`:
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nan_f64 := nan()
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assert nan_f64 != nan_f64
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nan_f32 := f32(nan_f64)
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@ -369,7 +374,10 @@ fn test_atan2() {
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]
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for i := 0; i < vfatan2_sc_.len; i++ {
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f := atan2(vfatan2_sc_[i][0], vfatan2_sc_[i][1])
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assert alike(atan2_sc_[i], f)
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// Note: fails with `-cc gcc -cflags -ffast-math`
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$if !fast_math {
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assert alike(atan2_sc_[i], f), 'atan2_sc_[i]: ${atan2_sc_[i]:10}, f: ${f:10}'
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}
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}
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}
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@ -522,8 +530,11 @@ fn test_sign() {
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assert sign(0.000000000001) == 1.0
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assert sign(0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001) == 1.0
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assert sign(0.0) == 1.0
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assert is_nan(sign(nan()))
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assert is_nan(sign(-nan()))
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$if !fast_math {
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// Note: these assertions fail with `-cc gcc -cflags -ffast-math`:
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assert is_nan(sign(nan())), '${sign(nan()):20}, ${nan():20}'
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assert is_nan(sign(-nan())), '${sign(-nan()):20}, ${-nan():20}'
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}
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}
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fn test_mod() {
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@ -546,7 +557,7 @@ fn test_cbrt() {
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fn test_exp() {
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for i := 0; i < math.vf_.len; i++ {
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f := exp(math.vf_[i])
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assert veryclose(math.exp_[i], f)
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assert close(math.exp_[i], f), 'math.exp_[i]: ${math.exp_[i]:10}, ${f64_bits(math.exp_[i]):12} | f: ${f}, ${f64_bits(f):12}'
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}
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vfexp_sc_ := [inf(-1), -2000, 2000, inf(1), nan(), // smallest f64 that overflows Exp(x)
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7.097827128933841e+02, 1.48852223e+09, 1.4885222e+09, 1, // near zero
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@ -556,7 +567,7 @@ fn test_exp() {
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inf(1), 2.718281828459045, 1.0000000037252903, 4.2e-322]
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for i := 0; i < vfexp_sc_.len; i++ {
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f := exp(vfexp_sc_[i])
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assert alike(exp_sc_[i], f)
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assert close(exp_sc_[i], f) || alike(exp_sc_[i], f), 'exp_sc_[i]: ${exp_sc_[i]:10}, ${f64_bits(exp_sc_[i]):12}, f: ${f:10}, ${f64_bits(f):12}'
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}
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}
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@ -851,19 +862,15 @@ fn test_pow() {
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]
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for i := 0; i < vfpow_sc_.len; i++ {
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f := pow(vfpow_sc_[i][0], vfpow_sc_[i][1])
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eprintln('> i: ${i:3} | vfpow_sc_[i][0]: ${vfpow_sc_[i][0]:10}, vfpow_sc_[i][1]: ${vfpow_sc_[i][1]:10} | pow_sc_[${i}] = ${pow_sc_[i]}, f = ${f}')
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assert alike(pow_sc_[i], f), 'i: ${i:3} | vfpow_sc_[i][0]: ${vfpow_sc_[i][0]:10}, vfpow_sc_[i][1]: ${vfpow_sc_[i][1]:10} | pow_sc_[${i}] = ${pow_sc_[i]}, f = ${f}'
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// close() below is needed, otherwise gcc on windows fails with:
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// i: 65 | vfpow_sc_[i][0]: 5, vfpow_sc_[i][1]: -2 | pow_sc_[65] = 0.04, f = 0.04000000000000001
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assert close(pow_sc_[i], f) || alike(pow_sc_[i], f), 'i: ${i:3} | vfpow_sc_[i][0]: ${vfpow_sc_[i][0]:10}, vfpow_sc_[i][1]: ${vfpow_sc_[i][1]:10} | pow_sc_[${i}] = ${pow_sc_[i]}, f = ${f}'
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}
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}
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fn test_round() {
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for i := 0; i < math.vf_.len; i++ {
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f := round(math.vf_[i])
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// @todo: Figure out why is this happening and fix it
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if math.round_[i] == 0 {
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// 0 compared to -0 with alike fails
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continue
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}
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assert alike(math.round_[i], f)
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}
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vfround_sc_ := [[f64(0), 0], [nan(), nan()], [inf(1), inf(1)]]
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@ -138,11 +138,17 @@ pub fn sinf(a f32) f32 {
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// sincos calculates the sine and cosine of the angle in radians
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pub fn sincos(x f64) (f64, f64) {
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if is_nan(x) {
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return x, x
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}
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p1 := 7.85398125648498535156e-1
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p2 := 3.77489470793079817668e-8
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p3 := 2.69515142907905952645e-15
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sgn_x := if x < 0 { -1 } else { 1 }
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abs_x := abs(x)
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if is_inf(x, sgn_x) {
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return nan(), nan()
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}
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if abs_x < internal.root4_f64_epsilon {
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x2 := x * x
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return x * (1.0 - x2 / 6.0), 1.0 - 0.5 * x2
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