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Perf: typed int **93 / pow(n,93) chained smul omit llvm.pow.f64 (#36386) #37656

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PurHur merged 1 commit into from
Sep 9, 2026
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Perf: typed int **93 / pow(n,93) chained smul omit llvm.pow.f64 (#36386) #37656

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3,091 changes: 3,090 additions & 1 deletion ext/standard/JitPowIntegerEmitHigh.php
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8 changes: 6 additions & 2 deletions lib/JIT/DiscardedPureCallElisionNativeLongPowFolds.php
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Expand Up @@ -185,20 +185,21 @@ trait DiscardedPureCallElisionNativeLongPowFolds
* - {@code $n ** 90} / {@code pow($n, 90)} → chained smul overflow→float (eightyninth × n)
* - {@code $n ** 91} / {@code pow($n, 91)} → chained smul overflow→float (ninetieth × n)
* - {@code $n ** 92} / {@code pow($n, 92)} → chained smul overflow→float (ninetyfirst × n)
* - {@code $n ** 93} / {@code pow($n, 93)} → chained smul overflow→float (ninetysecond × n)
*
* Omits {@code llvm.pow.f64} and the siToFp/fpToSi round-trip on the
* integer fast path ({@see \PHPCompiler\ext\standard\JitPow}). Peer
* compile-time {@code * 1} identity ({@see nativeLongArithIsCompileTimeIdentityOrZero})
* and {@code * 2^k} shl ({@see nativeLongMulCompileTimePowerOfTwoShift}).
*
* Float exponents ({@code 0.0}/{@code 1.0}/{@code 2.0}/{@code 3.0}/{@code 4.0}/{@code 5.0}/{@code 6.0}/{@code 7.0}/{@code 8.0}/{@code 9.0}/{@code 10.0}/{@code 11.0}/{@code 12.0}/{@code 13.0}/{@code 14.0}/{@code 15.0}/{@code 16.0}/{@code 17.0}/{@code 18.0}/{@code 19.0}/{@code 20.0}/{@code 21.0}/{@code 22.0}/{@code 23.0}/{@code 24.0}/{@code 25.0}/{@code 26.0}/{@code 27.0}/{@code 28.0}/{@code 29.0}/{@code 30.0}/{@code 31.0}/{@code 32.0}/{@code 33.0}/{@code 34.0}/{@code 35.0}/{@code 36.0}/{@code 37.0}/{@code 38.0}/{@code 39.0}/{@code 40.0}/{@code 41.0}/{@code 42.0}/{@code 43.0}/{@code 44.0}/{@code 45.0}/{@code 46.0}/{@code 47.0}/{@code 48.0}/{@code 49.0}/{@code 50.0}/{@code 51.0}/{@code 52.0}/{@code 53.0}/{@code 54.0}/{@code 55.0}/{@code 56.0}/{@code 57.0}/{@code 58.0}/{@code 59.0}/{@code 60.0}/{@code 61.0}/{@code 62.0}/{@code 63.0}/{@code 64.0}/{@code 65.0}/{@code 66.0}/{@code 67.0}/{@code 68.0}/{@code 69.0}/{@code 70.0}/{@code 71.0}/{@code 72.0}/{@code 73.0}/{@code 74.0}/{@code 75.0}/{@code 76.0}/{@code 77.0}/{@code 78.0}/{@code 79.0}/{@code 80.0}/{@code 81.0}/{@code 82.0}/{@code 83.0}/{@code 84.0}/{@code 85.0}/{@code 86.0}/{@code 87.0}/{@code 88.0}/{@code 89.0}/{@code 90.0}/{@code 91.0}) stay
* Float exponents ({@code 0.0}/{@code 1.0}/{@code 2.0}/{@code 3.0}/{@code 4.0}/{@code 5.0}/{@code 6.0}/{@code 7.0}/{@code 8.0}/{@code 9.0}/{@code 10.0}/{@code 11.0}/{@code 12.0}/{@code 13.0}/{@code 14.0}/{@code 15.0}/{@code 16.0}/{@code 17.0}/{@code 18.0}/{@code 19.0}/{@code 20.0}/{@code 21.0}/{@code 22.0}/{@code 23.0}/{@code 24.0}/{@code 25.0}/{@code 26.0}/{@code 27.0}/{@code 28.0}/{@code 29.0}/{@code 30.0}/{@code 31.0}/{@code 32.0}/{@code 33.0}/{@code 34.0}/{@code 35.0}/{@code 36.0}/{@code 37.0}/{@code 38.0}/{@code 39.0}/{@code 40.0}/{@code 41.0}/{@code 42.0}/{@code 43.0}/{@code 44.0}/{@code 45.0}/{@code 46.0}/{@code 47.0}/{@code 48.0}/{@code 49.0}/{@code 50.0}/{@code 51.0}/{@code 52.0}/{@code 53.0}/{@code 54.0}/{@code 55.0}/{@code 56.0}/{@code 57.0}/{@code 58.0}/{@code 59.0}/{@code 60.0}/{@code 61.0}/{@code 62.0}/{@code 63.0}/{@code 64.0}/{@code 65.0}/{@code 66.0}/{@code 67.0}/{@code 68.0}/{@code 69.0}/{@code 70.0}/{@code 71.0}/{@code 72.0}/{@code 73.0}/{@code 74.0}/{@code 75.0}/{@code 76.0}/{@code 77.0}/{@code 78.0}/{@code 79.0}/{@code 80.0}/{@code 81.0}/{@code 82.0}/{@code 83.0}/{@code 84.0}/{@code 85.0}/{@code 86.0}/{@code 87.0}/{@code 88.0}/{@code 89.0}/{@code 90.0}/{@code 91.0}/{@code 92.0}) stay
* on the float path — Zend returns {@code float} for those shapes.
*
* php-src: Zend/zend_operators.c {@code pow_function} /
* {@code zend_pow} / {@code mul_function}; ext/standard/math.c
* {@code PHP_FUNCTION(pow)}.
*
* @return 'one'|'identity'|'square'|'cube'|'fourth'|'fifth'|'sixth'|'seventh'|'eighth'|'ninth'|'tenth'|'eleventh'|'twelfth'|'thirteenth'|'fourteenth'|'fifteenth'|'sixteenth'|'seventeenth'|'eighteenth'|'nineteenth'|'twentieth'|'twentyfirst'|'twentysecond'|'twentythird'|'twentyfourth'|'twentyfifth'|'twentysixth'|'twentyseventh'|'twentyeighth'|'twentyninth'|'thirtieth'|'thirtyfirst'|'thirtysecond'|'thirtythird'|'thirtyfourth'|'thirtyfifth'|'thirtysixth'|'thirtyseventh'|'thirtyeighth'|'thirtyninth'|'fortieth'|'fortyfirst'|'fortysecond'|'fortythird'|'fortyfourth'|'fortyfifth'|'fortysixth'|'fortyseventh'|'fortyeighth'|'fortyninth'|'fiftieth'|'fiftyfirst'|'fiftysecond'|'fiftythird'|'fiftyfourth'|'fiftyfifth'|'fiftysixth'|'fiftyseventh'|'fiftyeighth'|'fiftyninth'|'sixtieth'|'sixtyfirst'|'sixtysecond'|'sixtythird'|'sixtyfourth'|'sixtyfifth'|'sixtysixth'|'sixtyseventh'|'sixtyeighth'|'sixtyninth'|'seventieth'|'seventyfirst'|'seventysecond'|'seventythird'|'seventyfourth'|'seventyfifth'|'seventysixth'|'seventyseventh'|'seventyeighth'|'seventyninth'|'eightieth'|'eightyfirst'|'eightysecond'|'eightythird'|'eightyfourth'|'eightyfifth'|'eightysixth'|'eightyseventh'|'eightyeighth'|'eightyninth'|'ninetieth'|'ninetyfirst'|'ninetysecond'|null fold to 1, keep base, mul square/cube/fourth/fifth/sixth/seventh/eighth/ninth/tenth/eleventh/twelfth/thirteenth/fourteenth/fifteenth/sixteenth/seventeenth/eighteenth/nineteenth/twentieth/twentyfirst/twentysecond/twentythird/twentyfourth/twentyfifth/twentysixth/twentyseventh/twentyeighth/twentyninth/thirtieth/thirtyfirst/thirtysecond/thirtythird/thirtyfourth/thirtyfifth/thirtysixth/thirtyseventh/thirtyeighth/thirtyninth/fortieth/fortyfirst/fortysecond/fortythird/fortyfourth/fortyfifth/fortysixth/fortyseventh/fortyeighth/fortyninth/fiftieth/fiftyfirst/fiftysecond/fiftythird/fiftyfourth/fiftyfifth/fiftysixth/fiftyseventh/fiftyeighth/fiftyninth/sixtieth/sixtyfirst/sixtysecond/sixtythird/sixtyfourth, sixtyfifth, sixtysixth, sixtyseventh, sixtyeighth, sixtyninth, seventieth, seventyfirst, seventysecond, seventythird, seventyfourth, seventyfifth, seventysixth, seventyseventh, seventyeighth, seventyninth, eightieth, eightyfirst, eightysecond, eightythird, eightyfourth, eightyfifth, eightysixth, eightyseventh, eightyeighth, eightyninth, ninetieth, ninetyfirst, or null
* @return 'one'|'identity'|'square'|'cube'|'fourth'|'fifth'|'sixth'|'seventh'|'eighth'|'ninth'|'tenth'|'eleventh'|'twelfth'|'thirteenth'|'fourteenth'|'fifteenth'|'sixteenth'|'seventeenth'|'eighteenth'|'nineteenth'|'twentieth'|'twentyfirst'|'twentysecond'|'twentythird'|'twentyfourth'|'twentyfifth'|'twentysixth'|'twentyseventh'|'twentyeighth'|'twentyninth'|'thirtieth'|'thirtyfirst'|'thirtysecond'|'thirtythird'|'thirtyfourth'|'thirtyfifth'|'thirtysixth'|'thirtyseventh'|'thirtyeighth'|'thirtyninth'|'fortieth'|'fortyfirst'|'fortysecond'|'fortythird'|'fortyfourth'|'fortyfifth'|'fortysixth'|'fortyseventh'|'fortyeighth'|'fortyninth'|'fiftieth'|'fiftyfirst'|'fiftysecond'|'fiftythird'|'fiftyfourth'|'fiftyfifth'|'fiftysixth'|'fiftyseventh'|'fiftyeighth'|'fiftyninth'|'sixtieth'|'sixtyfirst'|'sixtysecond'|'sixtythird'|'sixtyfourth'|'sixtyfifth'|'sixtysixth'|'sixtyseventh'|'sixtyeighth'|'sixtyninth'|'seventieth'|'seventyfirst'|'seventysecond'|'seventythird'|'seventyfourth'|'seventyfifth'|'seventysixth'|'seventyseventh'|'seventyeighth'|'seventyninth'|'eightieth'|'eightyfirst'|'eightysecond'|'eightythird'|'eightyfourth'|'eightyfifth'|'eightysixth'|'eightyseventh'|'eightyeighth'|'eightyninth'|'ninetieth'|'ninetyfirst'|'ninetysecond'|'ninetythird'|null fold to 1, keep base, mul square/cube/fourth/fifth/sixth/seventh/eighth/ninth/tenth/eleventh/twelfth/thirteenth/fourteenth/fifteenth/sixteenth/seventeenth/eighteenth/nineteenth/twentieth/twentyfirst/twentysecond/twentythird/twentyfourth/twentyfifth/twentysixth/twentyseventh/twentyeighth/twentyninth/thirtieth/thirtyfirst/thirtysecond/thirtythird/thirtyfourth/thirtyfifth/thirtysixth/thirtyseventh/thirtyeighth/thirtyninth/fortieth/fortyfirst/fortysecond/fortythird/fortyfourth/fortyfifth/fortysixth/fortyseventh/fortyeighth/fortyninth/fiftieth/fiftyfirst/fiftysecond/fiftythird/fiftyfourth/fiftyfifth/fiftysixth/fiftyseventh/fiftyeighth/fiftyninth/sixtieth/sixtyfirst/sixtysecond/sixtythird/sixtyfourth, sixtyfifth, sixtysixth, sixtyseventh, sixtyeighth, sixtyninth, seventieth, seventyfirst, seventysecond, seventythird, seventyfourth, seventyfifth, seventysixth, seventyseventh, seventyeighth, seventyninth, eightieth, eightyfirst, eightysecond, eightythird, eightyfourth, eightyfifth, eightysixth, eightyseventh, eightyeighth, eightyninth, ninetieth, ninetyfirst, ninetysecond, ninetythird, or null
*/
public static function nativeLongPowCompileTimeExponentFold(
Variable $exponent
Expand Down Expand Up @@ -486,6 +487,9 @@ public static function nativeLongPowCompileTimeExponentFold(
if (92 === $e) {
return 'ninetysecond';
}
if (93 === $e) {
return 'ninetythird';
}

return null;
}
Expand Down
4 changes: 2 additions & 2 deletions script/size-budgets.json
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Expand Up @@ -724,9 +724,9 @@
"note": "integer pow()/ ** hub: Low/Mid/Exponents50to69/Exponents70to79/High dispatch only (#36387/#36386)"
},
"ext/standard/JitPowIntegerEmitHigh.php": {
"budget": 32883,
"budget": 35972,
"target": 40000,
"note": "integer pow()/ ** chained-smul emit for compile-time exponents 80..92 extracted from JitPowIntegerEmit (#36387/#36386)"
"note": "integer pow()/ ** chained-smul emit for compile-time exponents 80..93 extracted from JitPowIntegerEmit (#36387/#36386)"
},
"ext/standard/JitPowIntegerEmitLow.php": {
"budget": 3985,
Expand Down
1 change: 1 addition & 0 deletions test/differential/OPCODE-CORPUS.md5
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Expand Up @@ -289,6 +289,7 @@ test/differential/cases/pow_nineteenth_smul_36386.php aafc67b69a6b7843ac706c090e
test/differential/cases/pow_ninetieth_smul_36386.php 450a0909426f9f18af085b169f193faa
test/differential/cases/pow_ninetyfirst_smul_36386.php 84be93828cace347396c3ace4b6660e7
test/differential/cases/pow_ninetysecond_smul_36386.php c8153b0dca26103220d33dcbc67cf004
test/differential/cases/pow_ninetythird_smul_36386.php 0031532bb9d830d07eda5e7e2c531fef
test/differential/cases/pow_ninth_smul_36386.php 48acf646cd7ccb6121a01dd0a8ad65fa
test/differential/cases/pow_seventeenth_smul_36386.php 1a32a1c8ef94785bf5b5cab539ed2d54
test/differential/cases/pow_seventh_smul_36386.php b05d4b0c338ac351cfab9e430afe6435
Expand Down
25 changes: 25 additions & 0 deletions test/differential/cases/pow_ninetythird_smul_36386.php
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@@ -0,0 +1,25 @@
<?php
declare(strict_types=1);
function work(int $n): int {
return $n ** 93;
}
function viaPow(int $n): int {
return pow($n, 93);
}
function overflow(int $n) {
return $n ** 93;
}
echo work(0), "
";
echo work(1), "
";
echo work(-1), "
";
echo viaPow(0), "
";
echo gettype(overflow(2)), "
";
echo gettype(overflow(-2)), "
";
echo gettype(overflow(PHP_INT_MAX)), "
";
173 changes: 173 additions & 0 deletions test/unit/NoThrowPowNinetythirdMulAotTest.php
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@@ -0,0 +1,173 @@
<?php

declare(strict_types=1);

namespace PHPCompiler\Test\Unit;

use PHPUnit\Framework\TestCase;

/**
* Typed integer {@code **} / {@code pow()} with compile-time exponent
* {@code 93} → {@code (ninetysecond*n)} chained smul
* overflow→float — omit {@code llvm.pow.f64} (#36386).
*
* php-src: Zend/zend_operators.c pow_function / zend_pow / mul_function;
* ext/standard/math.c PHP_FUNCTION(pow).
* Peer: ** 2–** 92 (#37273…/#37654), ** 0 / ** 1 (#37269).
* Note: {@code (±2)**93} and larger magnitudes promote to float (signed i64).
* Odd exponent: {@code (-1)**93 === -1}.
*
* @group aot-lint
*/
final class NoThrowPowNinetythirdMulAotTest extends TestCase
{
public function testPowNinetythirdOmitsFpowUsesSmul(): void
{
$src = <<<'PHP'
<?php
declare(strict_types=1);
function work(int $n): int {
return $n ** 93;
}
echo work(0), "\n";
echo work(1), "\n";
echo work(-1), "\n";
PHP;
$this->assertPowNinetythird($src, 'work', ['0', '1', '-1']);
}

public function testBuiltinPowNinetythird(): void
{
$src = <<<'PHP'
<?php
declare(strict_types=1);
function work(int $n): int {
return pow($n, 93);
}
echo work(-1), "\n";
PHP;
$this->assertPowNinetythird($src, 'work', ['-1']);
}

public function testPowNinetythirdOverflowPromotesToFloat(): void
{
$src = <<<'PHP'
<?php
declare(strict_types=1);
function work(int $n) {
return $n ** 93;
}
echo gettype(work(2)), "\n";
echo gettype(work(-2)), "\n";
echo gettype(work(PHP_INT_MAX)), "\n";
PHP;
$path = sys_get_temp_dir().'/phpc_pow93_ov_'.getmypid().'.php';
$bin = sys_get_temp_dir().'/phpc_pow93_ov_'.getmypid().'.bin';
file_put_contents($path, $src);
try {
putenv('PHP_COMPILER_DUMP_IR=1');
putenv('PHP_COMPILER_CACHE=0');
$cmd = escapeshellarg(PHP_BINARY).' '
.escapeshellarg(__DIR__.'/../../bin/compile.php').' -o '
.escapeshellarg($bin).' '.escapeshellarg($path).' 2>&1';
exec($cmd, $out, $rc);
$this->assertSame(0, $rc, implode("\n", $out));
$body = $this->functionBody((string) file_get_contents('/tmp/phpc-last.ll'), 'work');
$this->assertStringNotContainsString('llvm.pow.f64', $body);
$this->assertStringContainsString('smul.with.overflow', $body);
exec(escapeshellarg($bin), $runOut, $runRc);
$this->assertSame(0, $runRc);
$this->assertSame(['double', 'double', 'double'], $runOut);
} finally {
putenv('PHP_COMPILER_DUMP_IR');
putenv('PHP_COMPILER_CACHE');
@unlink($path);
@unlink($bin);
}
}

public function testRuntimeExponentKeepsPow(): void
{
$src = <<<'PHP'
<?php
declare(strict_types=1);
function work(int $n, int $e): int {
return $n ** $e;
}
echo work(-1, 93), "\n";
PHP;
$path = sys_get_temp_dir().'/phpc_pow93_rt_'.getmypid().'.php';
$bin = sys_get_temp_dir().'/phpc_pow93_rt_'.getmypid().'.bin';
file_put_contents($path, $src);
try {
putenv('PHP_COMPILER_DUMP_IR=1');
putenv('PHP_COMPILER_CACHE=0');
$cmd = escapeshellarg(PHP_BINARY).' '
.escapeshellarg(__DIR__.'/../../bin/compile.php').' -o '
.escapeshellarg($bin).' '.escapeshellarg($path).' 2>&1';
exec($cmd, $out, $rc);
$this->assertSame(0, $rc, implode("\n", $out));
$body = $this->functionBody((string) file_get_contents('/tmp/phpc-last.ll'), 'work');
$this->assertTrue(
false !== strpos($body, 'llvm.pow.f64')
|| false !== strpos($body, '@llvm.pow')
|| false !== strpos($body, 'phpc_fpow')
|| false !== strpos($body, '__phpc_pow_int'),
"expected pow intrinsic/helper in IR:\n".$body
);
exec(escapeshellarg($bin), $runOut, $runRc);
$this->assertSame(0, $runRc);
$this->assertSame(['-1'], $runOut);
} finally {
putenv('PHP_COMPILER_DUMP_IR');
putenv('PHP_COMPILER_CACHE');
@unlink($path);
@unlink($bin);
}
}

/**
* @param list<string> $expectedRun
*/
private function assertPowNinetythird(string $src, string $fn, array $expectedRun): void
{
$path = sys_get_temp_dir().'/phpc_pow93_'.getmypid().'.php';
$bin = sys_get_temp_dir().'/phpc_pow93_'.getmypid().'.bin';
file_put_contents($path, $src);
try {
putenv('PHP_COMPILER_DUMP_IR=1');
putenv('PHP_COMPILER_CACHE=0');
$cmd = escapeshellarg(PHP_BINARY).' '
.escapeshellarg(__DIR__.'/../../bin/compile.php').' -o '
.escapeshellarg($bin).' '.escapeshellarg($path).' 2>&1';
exec($cmd, $out, $rc);
$this->assertSame(0, $rc, implode("\n", $out));
$body = $this->functionBody((string) file_get_contents('/tmp/phpc-last.ll'), $fn);
$this->assertStringNotContainsString('llvm.pow.f64', $body);
$this->assertStringNotContainsString('@llvm.pow', $body);
$this->assertStringNotContainsString('phpc_fpow', $body);
$this->assertStringContainsString('smul.with.overflow', $body);
exec(escapeshellarg($bin), $runOut, $runRc);
$this->assertSame(0, $runRc);
$this->assertSame($expectedRun, $runOut);
} finally {
putenv('PHP_COMPILER_DUMP_IR');
putenv('PHP_COMPILER_CACHE');
@unlink($path);
@unlink($bin);
}
}

private function functionBody(string $ll, string $fn): string
{
if (!preg_match(
'/define[^\n]*@'.preg_quote($fn, '/').'[^\n]*\{(.*?)\n\}/s',
$ll,
$m
)) {
$this->fail("function @{$fn} not found in IR");
}

return $m[1];
}
}
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