diff --git a/src/compiler/asm_target.c b/src/compiler/asm_target.c
index b6918267e..23cca4492 100644
--- a/src/compiler/asm_target.c
+++ b/src/compiler/asm_target.c
@@ -709,6 +709,10 @@ static void init_asm_x86(PlatformTarget* target)
 	reg_instr(target, "pushw", "r16/mem/imm16");
 	reg_instr(target, "popw", "w:r16/mem");
 
+	reg_instr_clob(target, "popcntw", cc_flag_mask, "w:r16, r16/mem");
+	reg_instr_clob(target, "popcntl", cc_flag_mask, "w:r32, r32/mem");
+	reg_instr_clob(target, "popcntq", cc_flag_mask, "w:r64, r64/mem");
+
 	target->clobber_name_list = X86ClobberNames;
 	target->extra_clobbers = "~{flags},~{dirflag},~{fspr}";
 	if (target->arch == ARCH_TYPE_X86)
diff --git a/test/unit/asm/popcnt.c3 b/test/unit/asm/popcnt.c3
new file mode 100644
index 000000000..a4b6f0b7d
--- /dev/null
+++ b/test/unit/asm/popcnt.c3
@@ -0,0 +1,25 @@
+module test::inline_asm::popcnt @if (env::X86_64);
+
+fn void popcntw() @test
+{
+	short src   = 0xF0;
+	short count = 0;
+	asm { popcntw count, src; }
+	assert(count == 4, "inline asm: popcntw failed");
+}
+
+fn void popcntl() @test
+{
+	int src   = 0xF0F0;
+	int count = 0;
+	asm { popcntl count, src; }
+	assert(count == 8, "inline asm: popcntl failed");
+}
+
+fn void popcntq() @test
+{
+	long src   = 0xF0F0_F0F0;
+	long count = 0;
+	asm { popcntq count, src; }
+	assert(count == 16, "inline asm: popcntq failed");
+}