Add popcnt support for pnacl
Detect popcount from cpuid and add feature flag in
pnacl.
BUG=660673
Review-Url: https://codereview.chromium.org/2458333002
Cr-Commit-Position: refs/heads/master@{#428632}
diff --git a/base/cpu_unittest.cc b/base/cpu_unittest.cc
index ec14620..9cabfd6 100644
--- a/base/cpu_unittest.cc
+++ b/base/cpu_unittest.cc
@@ -57,6 +57,11 @@
__asm__ __volatile__("crc32 %%eax, %%eax\n" : : : "eax");
}
+ if (cpu.has_popcnt()) {
+ // Execute a POPCNT instruction.
+ __asm__ __volatile__("popcnt %%eax, %%eax\n" : : : "eax");
+ }
+
if (cpu.has_avx()) {
// Execute an AVX instruction.
__asm__ __volatile__("vzeroupper\n" : : : "xmm0");
@@ -100,6 +105,11 @@
__asm crc32 eax, eax;
}
+ if (cpu.has_popcnt()) {
+ // Execute a POPCNT instruction.
+ __asm popcnt eax, eax;
+ }
+
// Visual C 2012 required for AVX.
#if _MSC_VER >= 1700
if (cpu.has_avx()) {
