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-rw-r--r--runtime/ia32/vararg.S12
1 files changed, 12 insertions, 0 deletions
diff --git a/runtime/ia32/vararg.S b/runtime/ia32/vararg.S
index ec55a454..78666c70 100644
--- a/runtime/ia32/vararg.S
+++ b/runtime/ia32/vararg.S
@@ -67,3 +67,15 @@ FUNCTION(__compcert_va_float64)
movl %edx, 0(%ecx)
ret
ENDFUNCTION(__compcert_va_float64)
+
+FUNCTION(__compcert_va_composite)
+ movl 4(%esp), %ecx // %ecx = ap parameter
+ movl 8(%esp), %edx // %edx = size of composite in bytes
+ movl 0(%ecx), %eax // %eax = current argument pointer
+ leal 3(%eax, %edx), %edx // advance by size
+ andl $0xfffffffc, %edx // and round up to multiple of 4
+ movl %edx, 0(%ecx) // update argument pointer
+ ret
+ENDFUNCTION(__compcert_va_composite)
+
+