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diff --git a/image/test/reftest/pngsuite-ancillary/qcms-asm-check.js b/image/test/reftest/pngsuite-ancillary/qcms-asm-check.js
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+++ b/image/test/reftest/pngsuite-ancillary/qcms-asm-check.js
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+// This is a workaround for bug 465088, that the qcms assembly doesn't
+// quite match the non-assembly output.
+
+function check_qcms_has_assembly()
+{
+ // We have assembly code on x86 and x86_64 architectures.
+ // Unfortunately, detecting that is a little complicated.
+
+ if (navigator.platform == "MacIntel") {
+ return true;
+ }
+
+ if (navigator.platform.indexOf("Win") == 0 || navigator.platform == "OS/2") {
+ // Assume all Windows and OS/2 is x86 or x86_64. We don't
+ // expose any way for Web content to check.
+ return true;
+ }
+
+ // On most Unix-like platforms, navigator.platform is basically
+ // |uname -sm|.
+ if (navigator.platform.match(/(i[3456]86|x86_64|amd64|i86)/)) {
+ return true;
+ }
+
+ return false;
+}
+
+var qcms_has_assembly = check_qcms_has_assembly();